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What's new in infectious diseases
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What's new in infectious diseases
All topics are updated as new evidence becomes available and our peer review process is complete.
Literature review current through: Sep 2017. | This topic last updated: Oct 18, 2017.

The following represent additions to UpToDate from the past six months that were considered by the editors and authors to be of particular interest. The most recent What's New entries are at the top of each subsection.


Pneumonic plague outbreak in Madagascar (October 2017)

Plague is endemic in Madagascar, where cases of bubonic plague occur almost yearly, mainly between September and April. An ongoing outbreak that started in the fall of 2017 is notable for the high number of pneumonic plague cases and for affecting major urban centers, including the capital city [1]. Cases typically occur in more remote, less populated rural regions. The risk of infection for international travelers to Madagascar remains low; avoiding crowded areas, contact with dead animals or infected tissue, and close contact with patients with known pneumonic plague is advised. Further details on this outbreak can be found on the World Health Organization and Centers for Disease Control and Prevention websites. (See "Epidemiology, microbiology and pathogenesis of plague (Yersinia pestis infection)", section on 'Geographic distribution' and "Clinical manifestations, diagnosis, and treatment of plague (Yersinia pestis infection)", section on 'Prevention'.)

Cholera epidemic in Yemen (August 2017)

Breakdowns in safe water, hygiene, and health services can contribute to epidemic transmission of cholera. In Yemen, where cholera is endemic and the public health infrastructure has been devastated by years of warfare, two rapidly sequential epidemics occurred at the end of 2016 and the middle of 2017. The second of these outbreaks amounts to the world's worst cholera outbreak to date, with approximately 500,000 cases of suspected cholera and 2000 associated fatalities recorded within only four months [2]. (See "Overview of cholera", section on 'Endemic versus epidemic infection'.)

Prevention of meningococcal infection in patients receiving eculizumab (August 2017)

Eculizumab is a monoclonal antibody used for treatment of complement-mediated hemolytic uremic syndrome and paroxysmal nocturnal hemoglobinuria. It has been associated with a 1000 to 2000-fold increased incidence of meningococcal disease, including life-threatening and fatal infection. Therefore, patients should be immunized with meningococcal vaccines (both ACYW135 and serogroup B), if possible, at least two weeks prior to receiving a first dose of eculizumab. However, invasive meningococcal disease has occurred among patients receiving eculizumab despite receipt of meningococcal vaccine, including infections caused by non-typeable strains not included in the vaccines [3]. Accordingly, in addition to vaccination, we suggest daily antimicrobial prophylaxis (penicillin or, for penicillin-allergic patients, a macrolide) for prevention of meningococcal infection in all patients treated with eculizumab. In addition, patients should be monitored for signs of meningococcal infection and evaluated immediately if infection is suspected. (See "Treatment and prevention of meningococcal infection", section on 'Patients receiving eculizumab'.)

Risk of tympanic membrane perforation with topical quinolones after tympanostomy (August 2017)

An observational study reported that treatment with quinolone ear drops, with or without added topical corticosteroids, after tympanostomy tube (TT) placement was associated with increased risk of tympanic membrane (TM) perforation compared with treatment with neomycin plus hydrocortisone drops [4]. While the study raises concerns regarding the safety of quinolone ear drops, the findings should be viewed as preliminary given the observational design and source of the data (Medicaid encounter and pharmacy billing data). In addition, this study evaluated only the risk of TM perforation and did not address other adverse effects, including ototoxicity, which is a well-established side effect of neomycin (and other aminoglycosides). Until additional data are available, we continue to suggest fluoroquinolone-containing drops as our preferred treatment for uncomplicated acute TT otorrhea. (See "Tympanostomy tube otorrhea in children: Causes, prevention, and management", section on 'Uncomplicated acute TTO'.)

Antibiotic therapy for skin abscess (July 2017)

Management of skin abscess consists of incision and drainage; the role of antibiotic therapy depends on individual clinical circumstances, including abscess size. In a randomized trial including more than 780 patients with skin abscess ≤5 cm (most were larger than 2 cm) who underwent incision and drainage, higher cure rates were observed among those who received antibiotic therapy with methicillin-resistant Staphylococcus aureus (MRSA) coverage (trimethoprim-sulfamethoxazole or clindamycin) than those who received placebo (82 or 83 percent versus 69 percent); MRSA was isolated in 49 percent of cases [5]. These findings support our approach to management of patients with skin abscess, in which we suggest antibiotic therapy in addition to incision and drainage for patients with skin abscess ≥2 cm. (See "Cellulitis and skin abscess in adults: Treatment", section on 'Role of antibiotic therapy'.)

Delafloxacin for treatment of skin and soft tissue infections (July 2017)

Delafloxacin, a fluoroquinolone, has been approved by the US Food and Drug Administration for treatment of bacterial skin and soft tissue infections. It has activity against staphylococci (including methicillin-resistant strains), gram-negative bacteria (including Pseudomonas aeruginosa and Enterobacteriaceae), and some anaerobes (including Clostridium difficile) but does not have activity against enterococci. In two phase III clinical trials, the drug was statistically noninferior to the combination of vancomycin and aztreonam at the endpoint of early clinical response at 48 to 72 hours [6,7]. Given limited clinical experience with delafloxacin, at this time its use should be reserved for patients who do not respond to or do not tolerate first-line antimicrobial agents. (See "Methicillin-resistant Staphylococcus aureus (MRSA) in adults: Treatment of skin and soft tissue infections", section on 'Delafloxacin'.)

Increasing incidence of multiply recurrent C. difficile infection (July 2017)

Recurrent C. difficile infection (CDI) is defined by complete abatement of CDI symptoms while on appropriate therapy, followed by subsequent reappearance of symptoms after treatment has been stopped. Patients who have experienced one recurrence of CDI are at significantly increased risk for further recurrences (multiply recurrent CDI or mrCDI). In one retrospective cohort study including more than 45,000 patients with CDI in the United States between 2001 and 2012, the annual incidence of mrCDI nearly doubled (from 0.0107 to 0.0309 cases per 1000 person-years) [8]. Risk factors for mrCDI included age, female sex, nursing home residence, and use of antibiotics, glucocorticoids, or proton-pump inhibitors within 90 days of CDI diagnosis. The increased incidence of mrCDI was independent of known risk factors for CDI, raising the possibility that the biology of CDI is changing. (See "Clostridium difficile in adults: Epidemiology, microbiology, and pathophysiology", section on 'Recurrent infection'.)

Treatment of nonpurulent cellulitis (June 2017)

Empiric antibiotic therapy for nonpurulent cellulitis (ie, with no purulent drainage and no associated abscess) should be active against beta-hemolytic streptococci and methicillin-susceptible Staphylococcus aureus (MSSA) but not necessarily methicillin-resistant S. aureus (MRSA). This approach is supported by a randomized trial of nearly 500 patients with nonpurulent cellulitis, in which cephalexin plus placebo (active against beta-hemolytic streptococci and MSSA) and cephalexin plus trimethoprim-sulfamethoxazole (TMP-SMX, which adds activity against MRSA) resulted in statistically similar clinical cure rates (69 versus 76 percent) [9]. Although there was a trend toward higher cure rates with the addition of TMP-SMX, the results were likely skewed by a relatively large number of patients who did not complete the full course of therapy. (See "Cellulitis and skin abscess in adults: Treatment", section on 'Cellulitis'.)

Decreased susceptibility to fluoroquinolones in Shigella infection (April 2017)

When treatment for Shigella infection is indicated, susceptibility testing should be performed to guide antimicrobial selection. In the United States, an increasing proportion of Shigella isolates have minimum inhibitory concentrations (MIC) to ciprofloxacin of 0.12 to 1 mcg/mL [10]. Although these MIC values are considered susceptible and their impact on treatment outcomes in Shigella is unknown, they are associated with resistance genes that result in worse outcomes with fluoroquinolone treatment in other Enterobacteriaceae. Clinicians should request the MIC to ciprofloxacin if it is not provided with susceptibility results and avoid fluoroquinolones if the MIC is ≥0.12 mcg/mL. (See "Shigella infection: Clinical manifestations and diagnosis", section on 'Susceptibility testing' and "Shigella infection: Treatment and prevention in adults", section on 'Antibiotic selection'.)

IDSA guidelines on healthcare-associated ventriculitis and meningitis (April 2017)

The Infectious Diseases Society of America published new guidelines related to healthcare-associated ventriculitis and meningitis in March 2017 [11]. They provide guidance for clinicians on the clinical manifestations, diagnosis, treatment, and prevention of ventriculitis and meningitis in patients with central nervous system hardware, with a focus on cerebrospinal fluid shunts and drains, and in patients who have had neurosurgery or head trauma. Main concepts include the need for a low threshold of suspicion given the potentially subtle clinical findings of these infections and the importance of selecting an antimicrobial regimen that has bactericidal activity and achieves adequate concentrations in the cerebrospinal fluid. Our recommendations are generally consistent with these guidelines. (See "Infections of cerebrospinal fluid shunts and other devices", section on 'Treatment' and "Initial therapy and prognosis of bacterial meningitis in adults", section on 'Healthcare-associated meningitis' and "Gram-negative bacillary meningitis: Treatment".)


Amphotericin B for the treatment of HIV-infected patients with Talaromyces marneffei (formerly Penicillium marneffei) infection (June 2017)

Talaromyces marneffei (formerly Penicillium marneffei) is an important cause of morbidity and mortality in HIV-infected and other immunosuppressed patients in Southeast Asia. For patients with moderate to severe disease outside the central nervous system, treatment typically includes amphotericin B for two weeks followed by oral itraconazole, but amphotericin B can be difficult to administer because of the need for intravenous access and potential toxicity. Nevertheless, the importance of initial therapy with amphotericin B was highlighted by an open-label randomized trial of 440 patients with end-stage HIV infection (median CD4 count 10 cells/microL) and talaromycosis, in which the mortality rate with amphotericin B for two weeks followed by itraconazole was similar at two weeks but lower at 24 weeks (11 versus 21 percent) compared with itraconazole alone for the duration of therapy [12]. The use of lipid amphotericin preparations may reduce the potential toxicity. (See "Diagnosis and treatment of Talaromyces (Penicillium) marneffei infection", section on 'Patients without central nervous system disease'.)

Healthcare-associated Candida auris infections in the United States (June 2017)

The emergence of a multidrug-resistant Candida species, Candida auris, was first reported from the United States and United Kingdom in 2016. It has been detected in over a dozen countries on five continents and has been associated with healthcare-associated outbreaks. As of July 2017, in the United States, 98 cases have been reported, with most cases occurring in New York (68 cases) and New Jersey (20 cases) [13,14]. The most common site of infection has been the bloodstream. Nearly all patients have had multiple underlying conditions and exposure to healthcare facilities. An echinocandin (anidulafungin, caspofungin, or micafungin) is the treatment of choice for C. auris infection [15]. (See "Epidemiology and pathogenesis of candidemia in adults", section on 'Emergence of C. auris' and "Treatment of candidemia and invasive candidiasis in adults", section on 'C. auris'.)


Pre-exposure prophylaxis for HIV in adolescent men who have sex with men (September 2017)

For adults at high risk for acquiring HIV, consistent use of daily tenofovir disoproxil fumarate-emtricitabine (TDF-FTC) can reduce the risk of acquiring HIV by greater than 90 percent. In the United States, TDF-FTC for pre-exposure prophylaxis (PrEP) is approved only for patients over 18 years of age; however, young men who have sex with men (MSM) are at particularly high risk of acquiring HIV. The Adolescent Trials Network studied daily TDF-FTC for PrEP in MSM aged 15 to 17 years; it was well tolerated among those who took their medications, but adherence was suboptimal [16]. Thus, clinicians using PrEP for this vulnerable population should closely assess adherence and promptly address potential barriers (eg, depression, active substance use, stigma). (See "Patient evaluation and selection for HIV pre-exposure prophylaxis", section on 'Adolescents'.)

Safety of tenofovir disoproxil fumarate during pregnancy (September 2017)

For HIV-infected pregnant women, tenofovir disoproxil fumarate (TDF) is a preferred agent to use as part of combination antiretroviral therapy (ART) in both resource-rich and limited settings. A recent meta-analysis reported that TDF increased neonatal mortality, and an accompanying British Medical Journal clinical practice guideline thus suggested zidovudine rather than TDF for HIV-infected pregnant women [17,18]. This conclusion was based on a single trial from Africa in which TDF-based ART resulted in higher rates of very preterm birth (<34 weeks) and neonatal mortality compared with zidovudine-based ART (each given with lopinavir-ritonavir), but not compared with zidovudine alone [19]. Given uncertainties regarding the trial results, potential interactions between TDF and lopinavir-ritonavir, and observational data suggesting safety of other TDF-containing regimens in pregnancy, we do not believe the evidence is clear enough to stop using TDF as a preferred agent (although we do not initiate TDF and lopinavir-ritonavir containing regimens during pregnancy). The British HIV Association also released a statement consistent with our position [20]. (See "Safety and dosing of antiretroviral medications in pregnancy", section on 'Very preterm birth/neonatal mortality'.)

Enhanced prophylaxis against co-infections in advanced HIV infection (September 2017)

Co-infections are major causes of morbidity and mortality among HIV-infected individuals in resource-limited settings. In a randomized trial in sub-Saharan Africa of 1800 HIV-infected adults and children with a CD4 cell count <100 cells/microL initiating antiretroviral therapy (ART) with a CD4 cell count <100 cells/microL, enhanced prophylaxis with trimethoprim-sulfamethoxazole (TMP-SMX), isoniazid, fluconazole, azithromycin, and albendazole reduced all-cause mortality more than standard prophylaxis with TMP-SMX and guideline-based isoniazid administration [21]. Despite the difference in pill burden, rates of self-reported ART adherence, virologic suppression, and serious drug-related adverse events were comparable across the two groups. Current World Health Organization recommendations for patients with advanced HIV infection include prophylaxis with TMP-SMX as well as screening and early treatment for cryptococcal and latent tuberculosis infection [22]. (See "The impact of antiretroviral therapy on morbidity and mortality of HIV infection in resource-limited settings", section on 'Enhanced prophylaxis' and "The impact of antiretroviral therapy on morbidity and mortality of HIV infection in resource-limited settings", section on 'Prevention of coinfections'.)

Dolutegravir-containing ART as salvage for initial NNRTI failure (August 2017)

For HIV-infected patients who fail initial non-nucleoside reverse transcriptase inhibitor (NNRTI)-based antiretroviral therapy (ART), a protease inhibitor-based regimen is often used. New clinical trial data support the use of a dolutegravir-based regimen for certain patients. In a multicenter trial that included 624 patients failing initial NNRTI-based therapy, a dolutegravir-based regimen resulted in higher rates of virologic suppression (82 versus 69 percent) than a pharmacologically boosted lopinavir-based regimen (each was used with two nucleoside reverse transcriptase inhibitors [NRTIs], at least one of which was fully active) [23]. For treatment of initial NNRTI failure, we use a dolutegravir-based regimen if genotype testing can confirm activity of at least one preferred NRTI. However, if genotype testing is not available or if there are no active NRTIs, we prefer a protease inhibitor-based regimen. (See "Selecting an antiretroviral regimen for treatment-experienced HIV-infected patients who are failing therapy", section on 'NNRTI-containing regimens'.)

Feasibility of test and treat strategy for HIV in Africa (June 2017)

Several community-based trials in Africa have been launched to evaluate whether a "test and treat" strategy can decrease HIV transmission in those areas. In an observational analysis of one of those trials from Uganda and Kenya, initiation of annual HIV screening and immediate linkage to care for antiretroviral therapy (ART) among a cohort of over 75,000 residents was associated with increases in the proportion of the HIV-infected individuals who were diagnosed (from 65 percent at baseline to 96 percent two years later), the proportion of diagnosed patients who initiated ART (80 to 93 percent), and the proportion of the total HIV-infected population who achieved viral suppression (45 to 80 percent) [24]. These results support the feasibility of a "test and treat" strategy, but the impact on HIV incidence within those communities is yet to be determined. (See "HIV infection: Risk factors and prevention strategies", section on 'Test and treat'.)

New once-daily raltegravir formulation (June 2017)

For patients with HIV infection, the most effective antiretroviral therapy regimens contain two different nucleoside reverse transcriptase inhibitors and an integrase strand transfer inhibitor (INSTI). Raltegravir, the first available INSTI, has traditionally required twice-daily dosing. In the United States, a new raltegravir formulation that allows once-daily dosing (two 600 mg tablets once daily) has recently been approved for treatment-naïve patients [25]. This approval continues to expand the treatment options for patients with newly diagnosed HIV infection, particularly when drug interactions limit the use of other once-daily INSTIs. (See "Selecting antiretroviral regimens for the treatment-naïve HIV-infected patient", section on 'Commonly used agents'.)


Updated guidelines for empiric antifungal therapy for children with fever and neutropenia (June 2017)

Updated guidelines from the International Pediatric Fever and Neutropenia Guideline Panel consider children with cancer or hematopoietic cell transplant as high risk for invasive fungal infection if they have acute myelogenous leukemia, high-risk acute lymphoblastic leukemia, relapsed acute leukemia, neutropenia for >10 days, or are receiving high-dose corticosteroids [26]. In contrast to the previous guideline, they weakly recommend against initiating empiric antifungal therapy for low-risk patients, using serial galactomannan to guide antifungal therapy, and obtaining computed tomography images of the sinuses before initiating antifungal therapy unless the patient has localizing signs or symptoms. They also now suggest abdominal imaging before initiation of antifungal therapy in high-risk patients. (See "Fever in children with chemotherapy-induced neutropenia", section on 'Antifungal therapy'.)


pH1N1-containing influenza vaccine and miscarriage (October 2017)

Multiple studies have reported that administration of inactivated influenza vaccines to pregnant women is not associated with an increased risk of maternal, fetal, or neonatal complications. One exception is a case-control study of a possible increase in spontaneous abortion among the subgroup of women vaccinated with two consecutive pH1N1-containing vaccines during the 2010-2011 and 2011-2012 seasons [27]. This study had several limitations that might have influenced the findings, and further confirmation is needed. We continue to strongly recommend routine influenza vaccination with trivalent or quadrivalent inactivated influenza vaccine, as the benefits outweigh any risks. (See "Influenza and pregnancy", section on 'Safety'.)

2017-2018 influenza immunization recommendations for the United States (September 2017)

The Advisory Committee on Immunization Practices (ACIP) and the American Academy of Pediatrics (AAP) have released recommendations for influenza immunization for the 2017-2018 season in the United States [28,29]. Routine influenza immunization with a licensed, age-appropriate vaccine (table 1) is recommended for all persons ≥6 months of age. Live attenuated influenza vaccine is not recommended for the 2017-2018 season. Pregnant women and persons with egg allergy of any severity can receive any licensed, age-appropriate inactivated influenza vaccine with standard immunization precautions. Although neither the ACIP nor the AAP provide a preference for a particular formulation, we favor a quadrivalent vaccine when available for adults <65 years and we recommend the high-dose vaccine for those ≥65 years. (See "Seasonal influenza in children: Prevention with vaccines", section on 'Types of vaccine' and "Seasonal influenza vaccination in adults", section on 'Choice of vaccine formulation' and "Influenza and pregnancy", section on 'Vaccination' and "Influenza vaccination in individuals with egg allergy", section on 'Safety of vaccines in patients with egg allergy'.)

Recombinant hemagglutinin influenza vaccine in older adults (June 2017)

Recombinant hemagglutinin influenza vaccines (Flublok and Flublok Quadrivalent) are produced using recombinant DNA technology and a baculovirus expression system rather than the traditional egg-based methods. In a randomized trial that included adults ≥50 years of age, Flublok Quadrivalent was more effective than the quadrivalent standard-dose inactivated vaccine for preventing influenza [30]. Flublok Quadrivalent has not been compared directly with the high-dose inactivated vaccine, which has been found to be more effective than the standard dose inactivated vaccine in older adults (including a mortality benefit). Flublok Quadrivalent is a reasonable alternative to the high-dose vaccine for older adults. (See "Seasonal influenza vaccination in adults", section on 'Recombinant hemagglutinin vaccine'.)

Missed opportunity for MMR vaccination during pretravel consultation (May 2017)

Measles is a highly contagious viral illness spread by respiratory droplets; complications include pneumonia, otitis media, and encephalitis. Travelers are at risk for measles infection, and measles, mumps, and rubella (MMR) vaccination is recommended for all international travelers without evidence of immunity. However, in a retrospective review including more than 6600 adults who visited a United States pretravel clinic and were eligible for MMR vaccine, fewer than half of these individuals received it during the consultation [31]. The pretravel visit provides an important opportunity to reduce the likelihood of importation and transmission of measles by ensuring that MMR vaccination (in addition to other routine immunizations) is current. (See "Immunizations for travel", section on 'Measles, mumps, and rubella'.)

Maternal Tdap vaccination and prevention of infant pertussis (May 2017)

Immunization with the tetanus, diphtheria, and acellular pertussis (Tdap) vaccine is recommended for women during each pregnancy in order to provide passive protection against pertussis to their infants. Although passive transfer of maternal antibodies can blunt the infant's own immune response to infant doses of the diphtheria, tetanus toxoids, and acellular pertussis (DTaP) vaccine, it does not appear to interfere with clinical vaccine efficacy. In a retrospective study of nearly 150,000 infants at every level of DTaP vaccine exposure, infants exposed in utero to Tdap vaccine were better protected against pertussis during the first year of life than infants not exposed in utero [32]. (See "Immunizations during pregnancy", section on 'Rationale, efficacy, and safety'.)


CDC guidelines for prevention of surgical site infection (June 2017)

The Centers for Disease Control published new guidelines for prevention of surgical site infection in May 2017; these update the prior guidelines published in 1999 [33]. The guidelines state that administration of antibiotic prophylaxis should be timed such that a bactericidal concentration is present in tissue at the time of incision, additional antibiotic prophylaxis is not necessary after the surgical incision is closed, and intraoperative skin preparation should be performed with an alcohol-based antiseptic (unless contraindicated). Our recommendations are generally consistent with these guidelines. (See "Overview of control measures for prevention of surgical site infection in adults" and "Antimicrobial prophylaxis for prevention of surgical site infection in adults".)


Investigational assay for rapid diagnosis of drug-resistant tuberculosis (October 2017)

Molecular tests that detect drug resistance in Mycobacterium tuberculosis are useful for guiding initial therapeutic decisions until definitive culture-based drug-susceptibility testing results are available. An investigational molecular assay that rapidly detects resistance to fluoroquinolones (ofloxacin and moxifloxacin), aminoglycosides (kanamycin and amikacin), and isoniazid was evaluated in a study of more than 300 patients with positive sputum culture for M. tuberculosis [34]. Compared with phenotypic drug susceptibility testing as the reference standard, sensitivity of the assay ranged from 71 to 88 percent for the different drugs, and specificity was ≥94 percent for all drugs except for moxifloxacin, for which specificity was 84 percent. It also performed well compared with DNA sequencing. This assay is a promising future tool for evaluation of patients with suspected drug-resistant tuberculosis. (See "Diagnosis of pulmonary tuberculosis in HIV-uninfected adults", section on 'Other assays'.)


Comparison of influenza diagnostic tests (October 2017)

Conventional reverse-transcriptase polymerase chain reaction (RT-PCR) is currently the preferred test for influenza because of its high sensitivity and specificity. Newer tests include rapid molecular assays and digital immunoassays (DIAs), which provide results more quickly than conventional RT-PCR and have higher sensitivity than traditional antigen detection tests. In a meta-analysis that compared various influenza assays to conventional RT-PCR, the pooled sensitivity of rapid molecular assays for influenza A viruses was 92 percent, versus 80 percent with DIAs and 54 percent with traditional rapid antigen tests [35]. If available, a rapid molecular assay can be used as an alternative to conventional RT-PCR. (See "Diagnosis of seasonal influenza in adults", section on 'Molecular assays' and "Diagnosis of seasonal influenza in adults", section on 'Choice of diagnostic test' and "Seasonal influenza in children: Clinical features and diagnosis", section on 'Approach to testing'.)

Preliminary findings of a Zika vaccine trial (October 2017)

Vaccine development for prevention of Zika virus infection is underway. In a phase 1 trial, three intradermal doses of an investigational Zika vaccine containing synthetic DNA (GLS-5700) induced detectable neutralizing antibodies by 14 weeks in all 40 recipients [36]. Serum from the study participants was able to protect immunocompromised mice from developing disease after challenge with Zika virus, indicating that vaccine-induced antibodies can prevent infection and disease in vivo. The efficacy of the vaccine in preventing human infection with Zika virus will need to be evaluated in an endemic region with a larger study population. (See "Zika virus infection: An overview", section on 'Vaccine development'.)

Increase in immune globulin dose for prevention of hepatitis A (September 2017)

Intramuscular immune globulin (IG) is protective against hepatitis A virus (HAV) infection and is used for pre- and postexposure prophylaxis instead of vaccination in certain situations. The level of neutralizing anti-HAV antibodies in GamaSTAN, the intramuscular IG product available in the United States, appears suboptimal, reflecting low prevalence of prior HAV infection among plasma donors [37]. Therefore, increased dosing for GamaSTAN is now recommended when used for HAV prevention [38,39]. The new dose for preexposure prophylaxis is 0.1 mL/kg (for anticipated risk of exposure up to one month) or 0.2 mL/kg (for anticipated risk of exposure up to two months, with repeat dosing every two months for longer anticipated risk). The new dose for postexposure prophylaxis is 0.1 mL/kg. (See "Hepatitis A virus infection: Prevention", section on 'Passive immunization'.)

Third dose of MMR for prevention of mumps in an outbreak setting (September 2017)

In the setting of a mumps outbreak, in addition to ensuring that incompletely immunized individuals receive the standard two-dose measles, mumps, and rubella (MMR) vaccine series, public health authorities may recommend a third dose of the MMR vaccine under certain circumstances (eg, two-dose vaccination coverage >90 percent, intense exposure setting, high attack rate). During a mumps outbreak at a university with over 20,000 enrolled students, almost all of whom had previously received two vaccine doses, nearly 5000 students received a third MMR dose [40]. The mumps attack rate (259 cases overall) was lower among students who had received three rather than two vaccine doses (6.7 versus 14.5 cases per 1000 persons); in an adjusted analysis, the third MMR dose was associated with a 78 percent lower risk of mumps. (See "Mumps", section on 'Prevention'.)

Severity of maternal Zika virus infection and birth outcome (September 2017)

Maternal-to-fetal transmission of Zika virus can occur with either symptomatic or asymptomatic maternal infection; the risk factors for transmission are unknown. In a prospective study from Rio de Janeiro of women with confirmed Zika virus infection during pregnancy, no association was observed between maternal disease severity (signs, symptoms, virus load) or prior dengue virus infection and adverse birth outcome defined as fetal loss or birth of a live infant with grossly abnormal clinical or brain imaging findings [41]. This finding supports the Centers for Disease Control and Prevention (CDC) recommendation for serial fetal ultrasound examinations in pregnant women with laboratory evidence of Zika virus infection, regardless of maternal disease severity. (See "Zika virus infection: Evaluation and management of pregnant women", section on 'Risk of vertical transmission and anomalies'.)

Lack of benefit of cytomegalovirus prophylaxis in critically ill patients (August 2017)

Cytomegalovirus (CMV) reactivation is common in critically ill immunocompetent patients and is associated with increased length of hospital and intensive care unit (ICU) stay, sepsis, and mortality. However, there is no evidence that antiviral prophylaxis in these patients leads to improved outcomes. In a placebo-controlled trial of CMV-seropositive immunocompetent patients with critical illness due to sepsis or trauma, prophylaxis with intravenous ganciclovir was associated with a reduced incidence of CMV reactivation. However, there was no difference between the groups in levels of the pro-inflammatory cytokine, interleukin-6 (the primary outcome), or in incidence of secondary bacteremia or fungemia, ICU length of stay, or mortality [42]. (See "Epidemiology, clinical manifestations, and treatment of cytomegalovirus infection in immunocompetent adults", section on 'Prophylaxis against reactivation'.)

HEV infection in Europe and outbreaks in Africa (August 2017)

Hepatitis E virus (HEV) infection has a global distribution and is most commonly transmitted through contaminated food or water. In July 2017, World Health Organization reported an outbreak of HEV in Nigeria, where a humanitarian crisis has resulted in poor access to safe water and health services [43]. An earlier outbreak in nearby Niger had been reported in May 2017. In a separate 2017 surveillance analysis, the European Centre for Disease Prevention reported an increase in the number of confirmed HEV cases in Europe from 514 cases in 2005 to 5617 cases in 2015 [44]. It is unclear if this represents a true rise in HEV incidence in Europe or an increase in case detection due to growing awareness and testing for HEV. (See "Hepatitis E virus infection", section on 'Epidemiology'.)

Novel HBV mutation associated with tenofovir and entecavir failure (August 2017)

For patients with chronic hepatitis B virus (HBV) infection, tenofovir is one of the preferred antiviral agents. To date, no signature tenofovir-resistance mutations have been identified in HBV. However, in a report of two HBV-infected patients with persistent viremia despite therapy with tenofovir and entecavir, molecular analyses identified a shared distinct mutation, rtS78T/sC69, which was associated with decreased susceptibility to both tenofovir and entecavir in vitro [45]. The prevalence and significance of this mutation remains to be determined. (See "Tenofovir for the treatment of adults with chronic HBV infection", section on 'Risk of resistance'.)

Glecaprevir-pibrentasvir and sofosbuvir-velpatasvir-voxilaprevir for chronic HCV infection (August 2017)

Treatment options for patients with chronic hepatitis C virus (HCV) continue to grow. Two new combination therapies, glecaprevir-pibrentasvir and sofosbuvir-velpatasvir-voxilaprevir, were recently approved by the Food and Drug Administration in the United States and are expected to be approved in Europe this year. Glecaprevir-pibrentasvir is highly effective for patients with genotypes 1 through 6 infection, offers the possibility of an eight-week regimen for most patients without cirrhosis, and can be used in patients with renal impairment (including those on dialysis) [46-49]. It is now one of our preferred regimens for all genotypes; regimen duration depends on the genotype, the presence of cirrhosis, and the treatment history (algorithm 1 and algorithm 2 and algorithm 3 and algorithm 4). Sofosbuvir-velpatasvir-voxilaprevir is highly effective in patients with genotypes 1 through 6 infection who have failed a prior direct acting antiviral (DAA) regimen and is now the main treatment option for those who have failed an NS5A inhibitor-containing regimen [50]. Like other contemporary DAA regimens, these new combinations are well tolerated, with common but mild side effects. (See "Treatment regimens for chronic hepatitis C virus genotype 1 infection in adults", section on 'Selection of treatment regimens' and "Treatment regimens for chronic hepatitis C virus genotypes 2 and 3 infection in adults", section on 'Selection of treatment regimen' and "Treatment regimens for chronic hepatitis C virus genotypes 4, 5, and 6 infection in adults", section on 'Selection of treatment regimens'.)

Updated guidance on diagnosis of Zika virus infection in pregnancy (July 2017)

The Centers for Disease Control and Prevention have updated their guidance for diagnosis of Zika virus infection in asymptomatic pregnant women (algorithm 5) [51]. Two major changes are: (1) for asymptomatic women with possible Zika virus exposure but no ongoing exposure, nucleic acid testing (NAT) is no longer recommended; and (2) for asymptomatic women with ongoing Zika virus exposure, first and second trimester IgM antibody testing is no longer recommended, but NAT should be performed three times during pregnancy. (See "Zika virus infection: Evaluation and management of pregnant women", section on 'Asymptomatic women with limited or ongoing risk of Zika virus exposure'.)

Risk of congenital Zika virus syndrome (June 2017)

The magnitude of risk of birth defects resulting from in utero exposure to Zika virus is uncertain. The Centers for Disease Control and Prevention identified over 2500 pregnant women in US territories with Zika virus infection in early 2017 [52]. Maternal Zika virus infection in the first trimester was associated with an 8 percent incidence of offspring with birth defects, but fell to 4 to 5 percent with infection in the second and third trimesters. Because of study limitations, these figures likely understate the true risk of any congenital adverse outcome. Importantly, structural birth defects were seen with similar frequency in infants born to women with and without clinical signs and symptoms of Zika virus infection during pregnancy. (See "Zika virus infection: Evaluation and management of pregnant women", section on 'Risk of vertical transmission and anomalies'.)

Respiratory tract infections and antibiotic overuse (June 2017)

Upper respiratory tract infection (URI) and acute bronchitis are among the most common reasons for antibiotic overprescription, and reducing use for these indications is a global health care priority.

A prospective cohort study assessing over 28,000 adults with acute cough lasting <3 weeks without radiographic evidence of pneumonia found no difference in rates of major complications, including hospital admission and death, when comparing patients given immediate antibiotic prescriptions with delayed prescription or no prescription [53].

In a cohort of low-risk patients 66 years and older who presented to their primary care physician with acute upper respiratory infection, 46 percent were treated with an antibiotic, with overprescribing rates highest for patients with acute bronchitis [54]. Physicians who saw high volumes of patients and mid- to late-career physicians were more likely to prescribe antibiotics.

These studies add further support to overuse and lack of benefit for routine use of antibiotics for patients with acute bronchitis. (See "Acute bronchitis in adults", section on 'Avoiding antibiotic overuse'.)

Rising rates of HCV infection in young women in the United States (May 2017)

In parallel with the opioid and injection drug use epidemic in the United States, rates of hepatitis C virus (HCV) infection have been increasing over the past decade. In particular, the annual number of acute HCV cases among women aged 15 to 44 years rose 3.6-fold from 2006 to 2014 [55]. An estimated 29,000 women with HCV infection gave birth each year between 2011 and 2014; since the risk of vertical transmission is approximately 5.8 percent, this implies that an estimated 1700 infants were infected annually during this time. These numbers highlight the importance of screening at-risk individuals and arranging follow-up for those with HCV infection. (See "Vertical transmission of hepatitis C virus", section on 'Incidence' and "Hepatitis C virus infection in children", section on 'Epidemiology'.)

Investigational low-cost, heat-stable rotavirus vaccine for infants (May 2017)

Rotavirus gastroenteritis is an important cause of mortality in children younger than five years. Although effective vaccines are available, cost and need for refrigeration have limited vaccine uptake. Bovine rotavirus pentavalent vaccine (BRV-PV) is an investigational live, oral, heat-stable vaccine that is administered to infants at 6, 10, and 14 weeks of age. In a placebo-controlled randomized trial in more than 3500 Nigerien infants, BRV-PV was 67 percent efficacious in preventing laboratory-confirmed severe rotavirus gastroenteritis [56]. BRV-PV is less expensive than currently licensed vaccines and holds promise for vaccination programs in areas where cold-chain capacity is limited. (See "Rotavirus vaccines for infants", section on 'Other vaccines'.)

Ebola virus outbreak in the Democratic Republic of the Congo (May 2017)

Ebola virus is among the most virulent pathogens in humans and has resulted in outbreaks in Central Africa, the Sudan, and West Africa. Since 1976 there have been eight outbreaks of Ebola virus in the Democratic Republic of the Congo (DRC). The most recent was reported in May of 2017 [57,58]. Information about this outbreak can be found on the World Health Organization website. The outbreak in the DRC prior to this occurred in 2014 and was quickly contained. (See "Epidemiology and pathogenesis of Ebola virus disease", section on 'Outbreaks in the Democratic Republic of the Congo'.)

HBV reactivation during HCV antiviral therapy (May 2017)

Reactivation of hepatitis B virus (HBV) can occur during direct-acting antiviral (DAA) therapy for hepatitis C virus (HCV) infection. Among 29 cases reported to the US Food and Drug Administration (FDA) or described in the literature between 2013 and 2016, reactivation occurred at an average of 53 days into DAA treatment and was not associated with a particular HCV genotype or DAA regimen [59]. Two cases were fatal, and one patient required liver transplant. Patients should be tested for HBV coinfection prior to initiation of HCV therapy, with HBV treatment initiated for those who meet criteria (table 2). HBV coinfected patients who do not initially meet HBV treatment criteria should be monitored for reactivation during HCV treatment. (See "Patient evaluation and selection for antiviral therapy for chronic hepatitis C virus infection", section on 'HBV coinfection' and "Overview of the management of chronic hepatitis C virus infection", section on 'Monitoring during antiviral therapy'.)


Lack of benefit with corticosteroid use for acute bronchitis (September 2017)

Corticosteroids are frequently used for symptom relief in patients with acute bronchitis, although no data support use for this indication. In a randomized trial comparing oral prednisolone with placebo in 401 adult outpatients with acute cough, symptomatic lower respiratory tract infection, and no indication for antibiotic treatment, there was no difference in symptom severity, duration of cough, or peak flow [60]. Patients with chronic lung disease or asthma were excluded. This study supports our advice to not prescribe corticosteroids in patients with acute bronchitis, apart from those with concurrent asthma or chronic obstructive pulmonary disease (COPD) exacerbations. (See "Acute bronchitis in adults", section on 'For cough'.)

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