How many good viruses are there in the human body?

Answer 1

A virus is never "good". There are forms of bacteria that are not harmful and the body needs to preform certain tasks, for example digesting fiber from plants is a job that the bacteria do.

That is not necessarily true:

"...It's is supposed by many evolutionary anthropologists that viruses, specifically retrovirus, which employ the enzyme RNA dependent DNA polymerase (reverse transcriptase), have been responsible for many of the translocations found in mammilian evolution. furthermore, several virus species are responsible for healthy bacterial growth, which, in turn, benefit the human host."

Biophreak

http://www.physicsforums.com/showthread.php?t=339992

"It is possible that telomerase, the enzyme involved in extending the lifetime of cells and maintaining stem cells, evolved from viral enzymes since it's closest relatives are retroviral reverse transcriptase enzymes."

Ygggdrasil

http://www.physicsforums.com/showthread.php?t=339992

Answer 2

we will never know as your body is constantly killing viruses and diseases every minute of every day, these viruses and bacteria/fungi/protista are constantly evolving into new species... so the answer is ( there are innumerable viruses capable of harming the human body and we don't know about all of them yet so cant put a number to this answer)

Answer 3

There are no "good" viruses in the human body. Viruses are typically harmful pathogens that can cause infections and disease. However, the human body does have beneficial bacteria and viruses that help regulate our immune system and overall health.