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Overview of non-falciparum malaria in nonpregnant adults and children

Authors
J Kevin Baird, PhD
Ric Price, MD
Section Editor
Johanna Daily, MD, MSc
Deputy Editor
Elinor L Baron, MD, DTMH

INTRODUCTION

Non-falciparum malaria refers to malaria infection due to Plasmodium species other than P. falciparum; these include P. vivax, P. ovale, P. malariae, and P. knowlesi (table 1) [1].

Worldwide, the greatest mortality due to malaria is associated with P. falciparum infection. Infections caused by P. knowlesi and P. vivax are also associated with significant risk of morbidity and mortality [2-4]; patients with uncomplicated malaria due to these species are vulnerable to deterioration even after initiation of treatment, and P. vivax infection may be complicated by recurrent infection and associated anemia [5]. Rarely, severe illness and death occur in the setting of infection with P. malariae or P. ovale [6-8].

The epidemiology, clinical manifestations, diagnosis, and treatment of non-falciparum malaria in nonpregnant adults and children will be reviewed here. Issues related to non-falciparum malaria in pregnant women are discussed separately, as are issues related to P. falciparum malaria. (See "Prevention and treatment of malaria in pregnant women", section on 'Non-falciparum malaria' and "Treatment of uncomplicated falciparum malaria in nonpregnant adults and children" and "Treatment of severe malaria".)

EPIDEMIOLOGY

The epidemiology of non-falciparum malaria is variable depending on the species, as described in the following sections. Issues related to chloroquine are most significant in the setting of P. vivax infection, as discussed below.

Non-falciparum malaria species

Plasmodium vivax — Of the non-falciparum species, P. vivax is the most important; approximately one-third of the world's population is at risk for infection caused by this species [1]. P. vivax accounts for approximately 9 percent of malaria cases worldwide and is the dominant malaria species outside Africa [9,10]. In most areas where P. vivax is prevalent, malaria transmission rates are low (the island of New Guinea is an exception); therefore, affected populations achieve little immunity, and people of all ages are at risk.

                          

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