What symptoms lead Dr. Weyland to his initial diagnosis

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?

essentially, one bacterial cell splits into two daugurer cells. bacterial offspring don't need or get care from their parents because they are in a sense their own parents. that said, some bacteria can and do depend on other bacteria especially in harsh environments such as bacterial microfilms in hot water tanks.