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London School of Hygiene & Tropical Medicine Malaria Centre

Researchers challenge the established perspective on "asymptomatic" malaria


19 January 2016
Malaria Centre members contribute to study suggesting “asymptomatic” infections are detrimental and require comprehensive action

Read the original press release on the University of California San Francisco website.

Many malaria infections are “asymptomatic" and do not cause obvious symptoms or severe disease. The prevailing view in the infectious disease community is that asymptomatic malaria infections are harmless and sometimes beneficial to the individual by conferring partial immunity from malaria and reducing the risk of severe disease.

In a PLOS Medicine article (link is external) out today, authors from the MEI and their collaborators present four strands of evidence that “asymptomatic” malaria infections are detrimental and that treatment will clinically benefit the individual.

The four strands of evidence include the following:

  • Malaria control interventions lead to decreases in all-cause mortality and morbidity, particularly from invasive bacterial disease;
  • Both asymptomatic and symptomatic malaria infections can cause anemia, increasing the risk of mortality;
  • A molecular mechanism indicates a direct causal association between malaria infection, anemia, and potentially fatal bacteremia; and
  • Malaria infections of any density are harmful to cognitive performance, as shown in the impact of malaria interventions on school performance in children.

In light of the serious health and societal consequences of malaria infections at any density, the authors call for “comprehensively tackling the reservoir of chronic human malaria infection.” Targeting asymptomatic infections not only contributes to malaria control and elimination efforts, but also provides enormous benefits to public health. In light of these potential gains, the authors assert that despite significant operational challenges to detecting and treating chronic malaria infections, asymptomatic cases can and should be targeted and treated.

Access the full article on the PLOS Medicine website.