Incidence of malaria-related fever and morbidity due to Plasmodium falciparum among HIV1-infected pregnant women: a prospective cohort study in South Benin

Alexandre Duvignaud, Lise Denoeud-Ndam, Jocelyn Akakpo, Komlan V Agossou, Aldric Afangnihoun, Didier G Komongui, Félix Atadokpédé, Lucien Dossou-Gbété, Pierre-Marie Girard, Djimon-Marcel Zannou, Michel Cot, Alexandre Duvignaud, Lise Denoeud-Ndam, Jocelyn Akakpo, Komlan V Agossou, Aldric Afangnihoun, Didier G Komongui, Félix Atadokpédé, Lucien Dossou-Gbété, Pierre-Marie Girard, Djimon-Marcel Zannou, Michel Cot

Abstract

Background: Malaria and HIV are two major causes of morbidity and mortality among pregnant women in sub-Saharan Africa. Foetal and neonatal outcomes of this co-infection have been extensively studied. However, little is known about maternal morbidity due to clinical malaria in pregnancy, especially malaria-related fever, in the era of generalized access to antiretroviral therapy and anti-malarial preventive strategies.

Methods: A cohort study was conducted in order to estimate the incidence rate and to determine the factors associated with malaria-related fever, as well as the maternal morbidity attributable to malaria in a high-transmission setting of South Benin among HIV-infected pregnant women. Four-hundred and thirty-two women who participated in a randomized trial testing strategies to prevent malaria in pregnancy were included and followed until delivery, with at least three scheduled visits during pregnancy. Confirmed malaria-related fever was defined as axillary temperature >37.5°C and a concomitant, positive, thick blood smear or rapid diagnostic test for Plasmodium falciparum. Suspected malaria-related fever was defined as an axillary temperature >37.5°C and the concomitant administration of an anti-malarial treatment in the absence of parasitological investigation.

Results: Incidence rate for confirmed malaria-related fever was of 127.9 per 1,000 person-year (PY) (95% confidence interval (CI): 77.4-211.2). In multivariate analysis, CD4 lymphocytes (Relative Risk (RR) for a 50 cells/mm3 variation = 0.82; CI: 0.71-0.96), antiretroviral treatment started before inclusion (RR = 0.34; CI: 0.12-0.98) and history of symptomatic malaria in early pregnancy (RR = 7.10; CI: 2.35-22.49) were associated with the incidence of confirmed or suspected malaria-related fever. More than a half of participants with parasitaemia were symptomatic, with fever being the most common symptom. The crude fraction of febrile episodes attributable to malaria was estimated at 91%.

Conclusions: This work highlights that malaria is responsible for a substantial morbidity in HIV-infected pregnant women, with cellular immunodepression as a major determinant, and establishes the possible advantage offered by the early initiation of antiretroviral treatment.

Trial registration: PACOME Study has been registered under the number NCT00970879.

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Source: PubMed

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