So we have infected people, per the item list.
Then Viruses.
Two completely different categories. I'm going out on a limb here and saying we should be cautious as to who we visit and when we use abilities. I'm imagining that, infected players can spread it via visits. That's why we have specific items to look for and cure the infected players. So, the Virus wincon could be simply to infect everyone.
But we also have items that clearly define lethal actions. So, again, could be a team for COVID/Viruses with the main element being spread/exposure but back up killing functions.