system
Given the following post, respond as if you're commenting on Reddit:
human
Does Superman have Kryptonian gut flora?

If he does, then how does his poop not spread a wildfire epidemic of Kryptonian E Coli, immune to antibiotics and fire and anything else? How is the entire Midwest not covered in a ten-foot invulnerable biofilm?
gpt
he probably does not have kryptonian gut flora anymore...Studies have shown that when you start living with people(this can actually even include your dog) you end up "syncing" you gut Microbiome. However even if he did maintain his original gut flora, it would be unlikely to affect earth species since these pathogens would be developed for kryptonian biology and would likely be unable to bind cellular receptors or even illicit the immune/inflammation response that is responsible for most symptoms when we are sick.