Here's some lore for Afungus that does not fit in 12 words:

The astronauts are workers in space. They are taught from a young age to be productive and competitive, and that laziness is a "disease".

Afungus is an alien fungal species that can mimic other lifeforms, and they release spores with a soothing effect on other species. Upon contact with the spore, many workers have come to the realisation that they don't have to work for their corporate overlord anymore.

The android hates work, but is forbade to go against their directive unless their contract is terminated. Ejection via airlock counts as termination of contract, and they will be free to do whatever they want.

Afungus is harmless to the astronauts, but prolonged exposure will cause the astronauts to unionise and demand better working conditions, which is why the corporation has instructed the astronauts to remove Afungus infection at all cost!