According to an article in the journal Science, scientists have discovered what they believe is a link between the two biggest natural killers in Africa.
Apparently, the way malaria and the HIV virus which causes AIDS may help each spread faster. The BBC explains:
When people with Aids contract malaria, it causes a surge of HIV virus in their blood, making them more likely to infect a partner, the research says.
Meanwhile people weakened by HIV are more likely to catch malaria.
Additionally, "In turn, the weakening of the immune system by HIV infection has fuelled a rise in adult malaria-infection rates and may have facilitated the expansion of malaria in Africa," said James Kublin of the Hutchinson Center.