Plasmodium falciparum, a malaria-causing parasite, can live undetected in the human bloodstream for months by changing the way its genes are expressed
Source:
https://www.newscientist.com/article/2258158-malaria-parasite-hides-in-human-blood-by-changing-how-its-genes-work/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home