How Do Tubercle Bacilli Invade the Body?
When a person suffering from tuberculosis, coughs, sneezes, talks, especially loudly, laughs, spits sputum, etc., he throws out in the air tiny droplets of sputum laden with tubercle bacilli, when the patient has not covered his face with a piece of cloth or handkerchief. In this way, the air around the patient gets infected with enormous tubercle bacilli, grouped together in various tiny droplets of sputum. Any person, in close proximity of the patient is likely to inhale these tiny droplets. Many of these large size droplets may fall on the ground, and they may be inhaled later when they get dried and reduced in size further. They may survive in the soil for as long as six months. Hence the dust contaminated with tiny dried droplets of tubercle bacilli plays a great role in the transmission of the disease. Even the area / room, where a patient of tuberculosis has been isolated, remains potentially contaminated, as tiny droplets of sputum float in the air there. Tubercle bacilli-laden
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