How may Charles Monet been exposed to a level 4 virus?

Charles Monet was likely exposed to a level 4 virus, specifically the Ebola virus, through his contact with infected primates while living in Africa. He worked in a region where the virus is endemic and had close interactions with animals, potentially including handling or consuming bushmeat. This direct exposure to the virus from an infected animal source is a common route for zoonotic transmission of high-risk pathogens.