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Patient education: Avoiding infections in pregnancy (Beyond the Basics)

Vanessa A Barss, MD, FACOG
Section Editor
Charles J Lockwood, MD, MHCM
Deputy Editor
Allyson Bloom, MD
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Like all adults and children, pregnant women are at risk for developing viral and bacterial infections. Infections are a particular concern during pregnancy since some infections are more severe in pregnant women or may harm the fetus or newborn. However, you can take steps to decrease the chance of developing a potentially harmful illness during pregnancy.


The following practices can help reduce the chance of exposure to infections known to cause problems during pregnancy.

Hygiene — Pregnant women can get infections by person-to-person contact, such as kissing, sexual contact, and handling another person’s body fluids (eg, saliva or urine) and then touching their eyes, nose, or mouth. Good hygiene practices, such as frequent hand washing and avoiding contact with another person's saliva through shared foods, drinks, or utensils, can lessen your chances of becoming infected with potentially harmful illnesses.

Good hygiene is particularly important for pregnant women who have young children or work with them, as in day care centers or schools. Some potentially harmful infections, such as cytomegalovirus, are more prevalent in young children.

Hand washing — Hand washing is an essential and very effective way to prevent the spread of infection. Hands should be washed before and after touching raw foods and eating, after going to the bathroom, after changing a diaper or assisting a child with toileting, after wiping a young child’s nose or drool, after handling garbage or dirty laundry, after touching animals or pets, after handling children’s toys, after contact with another person’s saliva, and after gardening or touching dirt/soil.

Hands should be wet with water and a plain or antimicrobial soap and then rubbed together for 15 to 30 seconds. Pay special attention to the fingernails, between the fingers, and the wrists. Rinse the hands thoroughly and, ideally, dry with a single use towel.

Alcohol-based hand rubs are a good alternative for disinfecting hands if a sink is not available. Spread hand rubs over the entire surface of hands, fingers, and wrists until dry. Hand rubs are available as a liquid or wipe in small, portable sizes that are easy to carry in a pocket or handbag. When a sink is available, visibly soiled hands should be washed with soap and water.

Food precautions — The US Food and Drug Administration provides free online information on Food Safety for Pregnant Women. In particular, products made from unpasteurized milk, raw cookie dough or cake batter, raw or undercooked meat or fish or shellfish, unpasteurized juice or cider, cold deli meats, raw sprouts, and store-made meat/seafood salads can contain bacteria that may be harmful for pregnant women. Raw fruits and vegetables should be washed before consuming.

Expert groups like the Food Safety and Inspection Services (www.fsis.usda.gov) and the Centers for Disease Control and Prevention also have guidelines for food safety for everyone, not just pregnant women. These food precautions are detailed in a separate topic. (See "Patient education: Food poisoning (foodborne illness) (Beyond the Basics)", section on 'Food poisoning prevention'.)

Insect borne illnesses — Pregnant women should take precautions that reduce the risk of acquiring mosquito-borne infections (eg, West Nile virus, Dengue virus, malaria, Zika virus). (See "Patient education: West Nile virus infection (Beyond the Basics)".)

Mosquito bites can be prevented through use of protective clothing (or screens or netting), avoiding the outdoors when mosquitoes are most active (dawn and dusk), and use of DEET-based insect repellents. DEET is the most effective insect repellent currently available. Products with 10 to 35 percent DEET are adequate in most circumstances. Used as recommended, DEET has an excellent safety record. Pregnant and breastfeeding women can use DEET. There have been no studies of picaridin use in pregnant women.

Updated information regarding mosquito repellents is available from the CDC at www.cdc.gov/ncidod/dvbid/westnile/RepellentUpdates.htm.

Sexually transmitted infections — Pregnant women should be aware that your risk of being infected with a sexually transmitted infection may increase if you have more than one sexual partner or if your partner has more than one sexual partner. If your partner may have other sexual partners, you should ask him to wear a condom to reduce the chance of getting a sexually transmitted infection, or you can use a female condom. You should avoid having sex, even with a condom, if your partner has signs of a sexually transmitted infection, such as discharge from the penis, pain when urinating, or blisters or sores on the genital skin. (See "Patient education: Genital herpes (Beyond the Basics)" and "Patient education: Gonorrhea (Beyond the Basics)" and "Patient education: Chlamydia (Beyond the Basics)" and "Patient education: Genital warts in women (Beyond the Basics)".)

Users of recreational drugs can acquire infections such as hepatitis and HIV from needle sharing and then transmit these infections through sexual contact.

Travel — Avoiding travel to high risk locations is one way to minimize the chances of becoming infected with certain infectious diseases, such as malaria, yellow fever, and Zika virus. The possibility of acquiring a food- or water-borne infectious disease is also higher in some parts of the world. For example, unpasteurized cheese is more widely available in France than in the United States. Women who are planning international travel during pregnancy should consult with a travel clinic about infection-related issues for the planned destination. (See "Patient education: General travel advice (Beyond the Basics)".)

Immunization — You should be up-to-date on your immunizations before pregnancy. Some immunizations, such as influenza, pertussis, and hepatitis B, can and should be given during pregnancy. Children and other family household members should also be up to date with their immunizations; this decreases a pregnant woman's risk of exposure to infections during pregnancy and both the mother and baby’s risks of exposure to infection after birth. Vaccine safety during pregnancy is discussed separately. (See "Patient education: Vaccination during pregnancy (Beyond the Basics)".)

Animal borne illnesses — Women who are pregnant or planning pregnancy should avoid contact with all rodents (and rodent droppings) and should not change cat litter boxes, or should wear gloves and then wash their hands. Precautions about handling pets and laboratory animals should be discussed with a healthcare provider. (See "Patient education: Animal and human bites (Beyond the Basics)".)

Airborne infections — Some infections are transmitted when a person inhales droplets containing germs that an infected person coughs or sneezes into the air. Minimizing close contact with an ill person and wearing a mask can reduce transmission. Good hand washing also decreases the chance of infecting oneself after touching surfaces with germ-containing droplets.


Several infectious diseases can cause problems in pregnancy. Currently, these infections cannot be prevented with a vaccine. These infections are best avoided by practicing good hygiene and avoiding direct contact with infected individuals (although this may be difficult in some cases).

Parvovirus B19 (Fifth disease) — Parvovirus B19 infection, also known as "fifth disease," is a common childhood viral infection. Since the infection is common during childhood, 40 to 60 percent of women are already immune by the time they become pregnant.

In adults, parvovirus causes mild to severe symptoms, including joint pain, fatigue, and body aches. A rash may appear on the face, trunk, arms, and legs. The rash on the face can be intensely red as though the person had been slapped (this is called a "slapped cheek" appearance). The illness generally resolves without treatment.

It is difficult to avoid contact with people who are infected with parvovirus because the infection is common in the community and an infected person is contagious before symptoms develop. Frequent hand washing and avoiding shared food, drinks, or utensils can help to prevent infection.

If you are exposed to parvovirus during pregnancy and you have not been tested previously, a blood test for parvovirus is recommended. A positive test soon after exposure means that you had the infection in the past and are now immune, so the fetus is protected from infection. If blood testing is initially negative, it may be repeated three to four weeks later to confirm that you have not developed the infection. (See "Parvovirus B19 infection during pregnancy".)

Pregnant women who become infected with parvovirus are monitored closely for signs of complications. Rarely, parvovirus can cause a miscarriage, fetal anemia (low blood count), or fetal heart problems.

Cytomegalovirus infection (CMV) — Cytomegalovirus (CMV) is a virus that is transmitted by sexual contact or close contact with an infected person's saliva, urine, or other body fluids. Being infected with CMV causes few or no problems in people with a healthy immune system. However, the virus can cause serious problems for infants of mothers who are infected with CMV during pregnancy. The risk of becoming infected with CMV for the first time is higher for pregnant women who live with young children or work in day care centers. (See "Cytomegalovirus infection in pregnancy".)

Currently, there is no way to prevent CMV infection. Medications to treat CMV in newborns are currently being studied. Vaccines against CMV are also being tested, but are not yet available. Good hygiene practices, especially hand washing, are important to decrease the chances of developing CMV infection during pregnancy. Guidelines from the Centers for Disease Control and Prevention (CDC) are available at www.cdc.gov/cmv/index.html, and include the following:

Wash your hands often with soap and water, especially after changing diapers, feeding a young child, wiping a young child’s nose or drool, and handling children’s toys

Don’t share food, drinks, or eating utensils with young children

Don’t put a child’s pacifier in your mouth

Don’t share a toothbrush with a young child

Avoid contact with saliva when kissing a child

Clean toys, countertops, and other surfaces that come into contact with children’s urine or saliva

If you develop a low-grade fever, sore throat, enlarged lymph nodes, and fatigue while pregnant, see your doctor or nurse. You may be tested for CMV with a blood test.

Most pregnant women with CMV do not need to be treated with antiviral therapy. Maternal antiviral therapy does not prevent fetal disease or reduce the risk of complications in the newborn. (See "Cytomegalovirus infection in pregnancy", section on 'Prenatal care and delivery'.)

There is a low risk of passing CMV infection to a newborn from breastfeeding. However, the benefits of breastfeeding outweigh the minimal risk of passing CMV through breast milk. (See "Patient education: Deciding to breastfeed (Beyond the Basics)".)

Toxoplasmosis — Toxoplasmosis is a parasitic illness that usually causes no symptoms. However, toxoplasmosis can affect the fetus if a woman becomes infected during pregnancy. (See "Toxoplasmosis and pregnancy".)

Pregnant women should avoid eating rare and uncooked meat, which can be a source of this parasite. House cats can also carry toxoplasmosis in their feces. Pregnant women should have someone else change the litter box or wear gloves and then wash their hands carefully afterwards. It is also important to wear gloves while gardening and to wash hands after working in the yard since the soil can be contaminated by cat feces.

Listeria — Listeria is a bacterial infection that can cause fetal death, premature birth, or newborn infection. It can be passed from an infected mother to her fetus through the blood. Signs and symptoms of Listeria include fever, chills, and back pain; a flu-like illness is the most common symptom. (See "Treatment, prognosis, and prevention of Listeria monocytogenes infection".)

Most people who become infected with Listeria have eaten food that is contaminated. Contaminated foods do not appear rotten or spoiled and it is not possible to know, based upon appearance or smell, if a food is safe. For this reason, women who are pregnant are advised to avoid foods that could contain Listeria (table 1). (See "Epidemiology and pathogenesis of Listeria monocytogenes infection".)

Chickenpox and rubella — If you have had chickenpox (varicella) and rubella, you do not have to worry about getting infected again during pregnancy. If you have not had these infections or vaccines to protect you from these infections, be sure to avoid contact with anyone with these infections, as they can be readily transmitted. These infections can be serious for both the mother and baby. However, if a nonimmune nonimmunized pregnant woman is exposed to an individual with chickenpox, VariZIG, a purified human immune globulin preparation, can be administered as soon as possible within 10 days of exposure and can reduce the risk of developing varicella infection and also attenuate the severity of infection in those who become infected.

Vaccination to protect you from chickenpox or rubella is not safe during pregnancy. (See "Varicella-zoster virus infection in pregnancy" and "Patient education: Chickenpox prevention and treatment (Beyond the Basics)" and "Rubella in pregnancy".)

Group B streptococcus — Many women normally carry group B streptococcus in their vagina and/or rectum. Although you will not have symptoms, you can transmit the bacteria to the baby during birth. This can cause a serious newborn infection. For this reason, pregnant women are checked for group B strep a few weeks before expected delivery and given antibiotics during labor if they carry the bacteria. (See "Neonatal group B streptococcal disease: Prevention" and "Patient education: Group B streptococcus and pregnancy (Beyond the Basics)".)

Genital herpes — Women who get genital herpes for the first time near the end of pregnancy or have genital lesions when they go into labor can transmit the infection to the baby during vaginal birth. If you or your partner has a history of genital herpes, talk to you doctor about the risk of newborn infection and ways to prevent it. (See "Genital herpes simplex virus infection and pregnancy" and "Patient education: Genital herpes (Beyond the Basics)".)

Hepatitis — There are several types of hepatitis. Hepatitis infection can be acquired in several ways, including sexually, by blood transfusion, by sharing needles, or during birth. If you or your partner has a history of hepatitis, talk to you doctor about the risk of newborn infection and ways to prevent it. (See "Hepatitis B and pregnancy" and "Vertical transmission of hepatitis C virus".)

HIV — HIV can be passed from a mother to her baby during pregnancy and birth. If you have HIV, appropriate treatment and pregnancy care can reduce this risk to a very low level. For this reason, it is important for all pregnant women to be tested for HIV. (See "Antiretroviral and intrapartum management of pregnant HIV-infected women and their infants in resource-rich settings".)

Zika virus — Zika virus is transmitted predominantly by mosquitoes infected with the virus, but sexual transmission from an infected partner or transmission from transfusion of blood from an infected donor can also occur. Maternal infection during pregnancy, especially early in pregnancy, may lead to fetal infection and pregnancy loss or serious birth defects, such as microcephaly (small head and brain) and impaired vision and hearing. Fetal infection can occur even if the mother has no symptoms of infection (fever, rash, conjunctivitis, muscle and joint pain, fatigue, headache).

Pregnant women can reduce their risk of infection by avoiding travel to areas with mosquito transmission of Zika virus, protecting themselves from mosquitos (see 'Insect borne illnesses' above), and using abstinence or condoms during pregnancy if their sex partner has traveled to or lives in an area with risk of Zika virus infection.

You should tell your health care provider promptly if you or your partner may have been exposed to Zika virus because of travel to or residence in an area where the virus is known to occur. Laboratory tests can be done to see if you have been infected and ultrasound examination can be performed to see if your baby appears to be developing normally. (See "Zika virus infection: Evaluation and management of pregnant women" and "Congenital Zika virus infection: Clinical features, evaluation, and management of the neonate".)

Influenza — Getting the influenza vaccine each year is important because pregnant women with influenza are more likely to develop severe illness and to die than nonpregnant women with influenza. Maternal vaccination also reduces the risk of stillbirth and protects the baby from influenza for several months after birth. The safety of influenza vaccine in pregnancy is well established; no specific concerns for pregnant women, their fetuses, infants, or school-age children have been identified in dozens of research studies and monitoring systems worldwide. (See "Influenza and pregnancy".)


The safety and availability of treatment for infection in pregnant women depends upon the type of infection and risk of harm (from the treatment or the infection) to the woman and her fetus. Pregnant women and their families are advised to discuss any concerns about infections or treatments with a healthcare provider.


Your healthcare provider is the best source of information for questions and concerns related to your medical problem.

This article will be updated as needed on our web site (www.uptodate.com/patients). Related topics for patients, as well as selected articles written for healthcare professionals, are also available. Some of the most relevant are listed below.

Patient level information — UpToDate offers two types of patient education materials.

The Basics — The Basics patient education pieces answer the four or five key questions a patient might have about a given condition. These articles are best for patients who want a general overview and who prefer short, easy-to-read materials.

Patient education: Vaccines and pregnancy (The Basics)
Patient education: How to plan and prepare for a healthy pregnancy (The Basics)
Patient education: Erythema infectiosum (fifth disease) (The Basics)
Patient education: Malaria (The Basics)

Beyond the Basics — Beyond the Basics patient education pieces are longer, more sophisticated, and more detailed. These articles are best for patients who want in-depth information and are comfortable with some medical jargon.

Patient education: Food poisoning (foodborne illness) (Beyond the Basics)
Patient education: West Nile virus infection (Beyond the Basics)
Patient education: Genital herpes (Beyond the Basics)
Patient education: Gonorrhea (Beyond the Basics)
Patient education: Chlamydia (Beyond the Basics)
Patient education: Genital warts in women (Beyond the Basics)
Patient education: General travel advice (Beyond the Basics)
Patient education: Vaccination during pregnancy (Beyond the Basics)
Patient education: Animal and human bites (Beyond the Basics)
Patient education: Deciding to breastfeed (Beyond the Basics)

Professional level information — Professional level articles are designed to keep doctors and other health professionals up-to-date on the latest medical findings. These articles are thorough, long, and complex, and they contain multiple references to the research on which they are based. Professional level articles are best for people who are comfortable with a lot of medical terminology and who want to read the same materials their doctors are reading.

Neonatal group B streptococcal disease: Prevention
Clinical manifestations and diagnosis of Listeria monocytogenes infection
Group B streptococcal infection in pregnant women
Group B streptococcus: Virulence factors and pathogenic mechanisms
Immunizations during pregnancy
Intra-amniotic infection (clinical chorioamnionitis or triple I)
Overview of TORCH infections
Prevention of arthropod and insect bites: Repellents and other measures
Rubella in pregnancy
Toxoplasmosis and pregnancy
Treatment, prognosis, and prevention of Listeria monocytogenes infection
Varicella-zoster virus infection in pregnancy
Parvovirus B19 infection during pregnancy
Cytomegalovirus infection in pregnancy
Congenital cytomegalovirus infection: Clinical features and diagnosis

The following organizations also provide reliable health information.

National Library of Medicine


Centers for Disease Control and Prevention (CDC)

     Toll-free: (800) 311-3435

Infectious Diseases Society of America



Literature review current through: Nov 2017. | This topic last updated: Thu Aug 03 00:00:00 GMT 2017.
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