system
Given the following post, respond as if you're commenting on Reddit:
human
[SUPERMAN] has anybody tried recovering any viruses or bacteria from the ship that brought him to earth? Would a kryptonian bio weapon kill the man of steel since his immune system has never had to fight anything?
gpt
A fungus from Krypton once survived a trip to Earth on a meteorite.  It was called the Bloodmorel, and it incapacitated Superman with fevered delusions.  He was the only person affected by the fungus, and he failed to find a cure for himself when he still had his wits.    

This suggests that, yes, a Kryptonian bio weapon could destroy Superman (and even leave terrestrial humans unscathed).