I think many people would have heard of tuberculosis, and then some. Tuberculosis is a contagious disease spread by coughing, sneezing, or even the patient while talking. The infection is from saliva or mucus and particles are suspended in the air for a long time. Especially in the presence of air flow, or rarely lit like a bazaar mall theater in the plane on the bus when we breathe, it is a chance to Mycobacterium tuberculosis infection. Thus, there is a vaccine against this disease vaccine elicited by a vaccine called BCG.
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