The bacteria that causes Tuberculosis (TB) is Mycobacterium tuberculosis. Of interest is that M. tuberculosis complex (MTBC) can also cause TB in humans, but is rare. This includes M. bovis, M. africanum, M. canetti and M. microti. Other Mycobacteria such as M. kansasii and M. avium can also cause pulmonary disease. This is different to TB.
Symptoms start 1 to 4 days after the virus enters the body. That means that you may be able to pass on the flu to someone else before you know you are sick, as well as while you are sick. Some people can be infected with the flu virus but have no symptoms. During this time, those persons may still spread the virus to others.
Probably one of the most common concerns we hear is from people who, right after getting a flu shot, got something that seems to them like flu. It is possible it could happen. After a dose of flu vaccine, it takes at least a week to become immune. If flu is in your community and you are exposed, it takes two or three days for symptoms to appear. So it is possible if you are exposed to flu to get sick before the vaccine has a chance to work. It gives people the impression the vaccine caused the flu.