What are the names of some bacteria and what do they do to help the body?

Question

Some good and bad ones please. Also, please tell me which ones are which. Thank you.

Answer 1

well bacterias from the body that belong to the normal flora are good for you cuz they help the body against other invasors but if this bacteria go to the wrong spot they can be very dangerous take a look at this normal flora ( good ones )

http://en.wikipedia.org/wiki/Human_flora  

bad bacterias (pathogens)

http://en.wikipedia.org/wiki/Pathogenic_...

also

http://en.wikipedia.org/wiki/Bacteria#Pa...