how long does (bcg)bacillus calmette guerin vacinne lastest in your body ?

Answer 1

It is a one time vaccine which allows your body to help create antibodies to TB. So it will only stick around for a period of time, but the fact that your body recognized it as foreign and produced the antibodies it will need if an exposure should occur.

Answer 2

The BCG vaccine itself does not stay long in the body. Its purpose, like all vaccines, is to stimulate your immune system to make antibodies to TB against the possibility of later encountering the TB Virus itself.