my first two playthroughs i thought i had to avoid the virus, and was confused by how easy it was lol.
then i realised you are supposed to get people infected, which made more sense as i progressed further.
cool game though! i wasn't quite fond of having to click one unit at a time, gets extra tricky when there's many on the screen, but this can easily be fix'd with upgrades or something (if you choose to expand)
good work!