It has been a while since these posts, I should really make update posts more often.
So the infection system has been replaced with a Virology system.
A virus doesn’t suddenly appear upon contact ingame, but they have a chance of appearing dormant when a player spawns.
There are several types of pathogens, those that spread via blood, contact, and airborne.
The fun spreading method in my opinion is airborne, since you only have to stand close to someone to be able to get an airborne virus.