Scientific theories are always proven. Saying a theory is not proven is nonsense on its face.
Oh, you didn't know that?

Viruses and bacteria cause disease.
1)Necrotizing fasciitis is a serious infection caused by Streptococcus pyogenes bacteria.
2)A strain of Staphylococcus aureus bacteria causes MRSA
3)Neisseria meningitidis and Streptococcus pneumoniae causes bacterial meningitis
4)Tuberculosis is typically caused by bacteria called Mycobacterium tuberculosis.
5)Cholera is an intestinal infection caused by the bacteria Vibrio cholerae.
6)Bacillary dysentery is an intestinal inflammation caused by bacteria in the genus Shigella.
Etc, etc, etc...

I don't have to ponder who is ignorant here.