A sneeze destroys a magical civilization

"According to modern medical research on Earth, a healthy person carries at least 140,000 types of viruses in his body, and the number of bacteria is even greater.
If such a person travels to a strange magical world, and the bacteria and viruses in his body mutate, and then suddenly break out without his knowledge, what will be the consequences?
I am not defending myself by saying this!
I just want to prove that I really didn’t mean to destroy that magical civilization!
It was just an accident, a terrible disaster.
besides! Don't call me a moving disaster!
That's slander!
It's a rumor!
It is a naked violation of reputation!
in addition! You followers of Talona, stay away!
I have nothing to do with your goddess! "
The famous planeswalker in the multiverse, Zuo Si (Thos), the only chosen one of the goddess of poison and disease (I refuse to admit it), issued a stern warning to those "black fans" and declared that if necessary, he would use extraordinary means to Defend your reputation.
Including but not limited to "humane destruction (physical)", forcible transformation into undead or shadow servants, extracting souls to make activation parts for magic machinery, and transporting people directly to the nine hells or the bottomless abyss...