Okay, this is going to sound weird. Today my brother went across the street to my neighbor's house. My brother is afraid of the stomach flu virus just like me. He rang the doorbell with his knuckle and the neighbors answered. He asked a question but they stated they were sick with the stomach flu. My brother did not touch anything but the doorbell with his knuckle. Will he or I get sick because of that action he did? Is it likely that I or he will contract a stomach flu virus from a door bell?

-Ben