Borneo were actually infected with P. knowlesi. Over the following decade, several investigators used molecular detection methods capable of distinguishing P. knowlesi from morphologically similar parasites to attribute an increasing proportion of malaria cases to P. knowlesi throughout Southeast Asia. Work with archival samples has shown that infection with this parasite has occurred in Malaysia at least since the 1990s. References External links CDC malaria page WHO malaria page P. knowlesi genome data Short film on the discovery of the role of P. knowlesi in human malaria knowlesi Parasites of primates