Germs was a henchman who served Roland Daggett. He was extremely germaphobic, to the point that he used handkerchiefs to open doors rather than touch the knobs with his bare hands.
Later, Germs was sent by Daggett to kill Fox in the hospital (a place Germs would've preferred to stay away from, fearful that he might catch a disease from "all those sick people"). Germs' attempt on Fox's life was thwarted by Batman, who cornered him in the hospital's viral pathology lab.
Threatening him with a beaker of what he claimed was crimson fever (but was really just water), Batman learned that it was Matt Hagen who had impersonated Bruce Wayne to fool Fox. Shortly afterwards, Clayface appeared and carried Germs to the roof, planning to throw him off to his death. Batman rescued him though, and after driving Clayface away left a traumatized Germs to be arrested by the police. Like with Bell, as there was no solid evidence against Germs for his crimes, it is unknown if he was ultimately imprisoned or not.