Malaria and HIV/AIDS - UNICEF Malaria Technical Note No. 6
“As HIV spreads, it interacts with other infectious diseases, facilitated by the increase in numbers of immunosuppressed individuals and because its own clinical course can be altered by other infections. Infectious diseases often ‘synergize’, or negatively affect each other, and this is most noticeable with HIV and tuberculosis (TB). In areas of high HIV prevalence, the incidence of TB infection is increased, with a resultant increase in mortality. In addition, susceptibility to HIV can be increased by other infections, notably sexually transmitted infections (STIs), leading to high rates of HIV transmission in communities with high prevalence of STIs.
In Africa, the HIV pandemic has been superimposed on the longstanding malaria pandemic, where P. falciparum malaria is consistently one of the major causes of infant and child mortality. The high prevalence of both HIV and malaria infection in Africa means that even small interactions between the two could have substantial effects on populations. With the inception of the Roll Back Malaria partnership in 1998, there was recognition that previous gradual declines in malaria mortality had been reversed during the 1990’s, and that interactions between malaria and HIV could be one contributor.
Early research did not indicate any direct, biological association between HIV and malaria, although it was noted that malaria-associated anaemia treated with unscreened blood transfusions contributed to HIV transmission. In more recent years, three key issues have focussed much of the research effort: 1] Does HIV/AIDS increase susceptibility to malaria infection or increase severity of acute malarial episodes? 2] Does malaria infection accelerate progression of HIV/AIDS? 3] What is the impact of malaria and HIV co-infection during pregnancy?
Effect of HIV on malaria: HIV infection increases the incidence and severity of clinical malaria. In non-pregnant adults, HIV infection has been found to roughly double the risk of malaria parasitemia and clinical malaria. In east and southern Africa, where HIV prevalence is near 30%, it is estimated that about one-quarter to one-third of clinical malaria in adults (including during pregnancy) can be accounted for by HIV.
Effect of malaria on HIV: Although the effect of malaria on HIV has not been so well documented, some recent research is now adding to the growing body of evidence. Acute malaria infection increases viral load, and one study found that this increased viral load was reversed by effective malaria treatment. This malaria-associated increase in viral load could lead to increased transmission of HIV and more rapid disease progression, with substantial public health implications.
HIV and malaria co-infection during pregnancy: Malaria infection is more frequent and more severe in HIV-positive pregnant women in malaria-endemic settings. Multigravidae with HIV infection are similar to primigravidae without HIV infection in terms of susceptibility to, and negative consequences of, malaria infection. Therefore, in the presence of HIV infection, the risk associated with placental malaria appears to be independent of the number of pregnancies. Pregnant women infected with both malaria and HIV are at higher risk of developing anaemia, delivering low birthweight infants, delivering prematurely… “
Text and photograph for this article courtesy UNICEF, a partner and Cooperating Organization with dgCommunity Youth for Development.
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