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.
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