Son Goku
Great Sage Equalling Heaven
A good place to start the discussion is why do you know the names of the viruses, bacteria and diseases you listed?
The simple answer is because they cause harm. Otherwise there is no reason for you to care about the billions of microbes which call your body home and benefit you in countless ways.
Just a small example are the microbes that have colonized your gastrointestinal system and without which you couldn’t digest properly, couldn’t build your immune system or that prevent other dangerous non beneficial microbes from invading and causing disease.
That wasn't the question. The question was "is there an infectious disease that actually improves someone instead of trying to kill them?" Nobody ever claimed all microscopic organisms caused disease, injury, or death.
The microbes you mentioned were not actually infectious diseases; if the microbes invade the body and multiply, they are by definition infectious. If the same microbes are not causing disease, they have low pathogenicity and are not virulent, thus they don't really qualify as infectious disease that actually improve someone since they never produced clinical disease in their host. An actual scientist/researcher should know that.
Inb4 you start juelzing.
What type a scientist are you? You a coli troll researcher?
This thread is for serious discussion (and tales of my workplace fukkery ).