One hundred thirty five afebrile HIV-1 positive children having negative blood slides for malaria were recruited at Apac Hospital and followed up for one year. They were monitored for development of P. falciparum malaria, which was treated with CQ+SP and the children followed up for 28 days. HIV-1 viral loads were measured over three time-points: at enrolment (no malaria), during an episode of malaria, and at a visit about 8 weeks (range 6-19 weeks) after the malaria visit when the child had neither parasites nor any intervening malaria episodes (post-malaria). Primary analyses were restricted to children who on follow up had HIV-1 viral loads measured at the three relevant time-points.

Malaria increased HIV-1 viral load significantly in CLWA. Low parasitaemia <= 5/HPF transiently increased viral load by 0.42 log (95% CI 0.29-0.78, p = 0.0002), higher than that reported in adults. These patients' viral loads returned to levels similar to those at baseline after treatment. In 13 patients with high parasitaemia (10-20/HPF), the mean increase in viral load was 0.53 log (0.14 to 0.51), p < 0.0001, remaining significantly higher than at baseline after treatment ie. mean difference (signed-rank test) in viral load "before" and "after" malaria was significant.

P. falciparum malaria increased HIV-1 viral loads in children, with some viral loads remaining elevated several weeks after antimalarial treatment. Prolonged post-treatment elevation has important implications for the clinical course and the potential for transmission in sexually active adults.