Smallpox has been eradicated from the planet, impossible to test for actions of a mushroom. Bird flu is caused by a virus, tuberculosis by a bacteria, difficult for a mushroom or what ever to act on both.
Folks, understand a virus is NOT a living organism, just a small piece of DNA in an envelope with a few enzymes. That's it. No respiration, no energy requirements, no digestive tract and can be crystallized like sugar or salt. Yes, I agree virus are weird to say in layman terms.