The Impact of Climate Change on Malaria

P-Vivax is more widely distributed geographically but less frequently lethal than the dominant form P- Phalsaparum. Vivax still makes people gravely ill though, and it possesses an evolutionary trick that PhalsapArum does not. It can lie dormant in the liver, causing no symptoms and not registering on blood tests until it reactivates. So a person who thinks they have recovered may not know they remain a danger to others.