Preparations

[Uthgaard]

That's why I thought you were talking about antibiotics. But you were saying vaccine. You use antibiotics for bacteria. Antibiotics come primarily from fungi. Virus particles can be killed any number of ways, including by bacteria.

Bacteria have been killing virus particles for a long time, they do it through things called restriction enzymes. But that isn't a vaccine and neither is iodine, a vaccine is a virus that has been essentially destroyed, or in more accurate terms, just the capsid and its native proteins, so the body can learn how to recognize and kill the virus itself.