the entire genetic range of P. falciparum in humans forms “a monophyletic lineage within the gorilla P. falciparum radiation.”9 In plain talk: The human version is one twig within a gorilla branch, suggesting that it came from a single spillover. That’s one mosquito biting one infected gorilla, becoming a carrier, and then biting one human. By delivering the parasite into a new host, that second bite was enough to account for a zoonosis that still kills more than a half million people each year.
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