Wednesday, February 8, 2012

what are the mode of spread of tuberculosis

what are the mode of spread of tuberculosis?
Infectious Diseases - 5 Answers
Random Answers, Critics, Comments, Opinions :
1 :
Breathing. A person with TB can infect you just by exhaling - they don't have to be coughing to be contagious.
2 :
Airborne bacteria
3 :
Exposure to tubercle bacilli in airborne droplet nuclei produced by people with pulmonary or laryngeal tuberculosis during expiratory efforts, such as coughing, singing or sneezing. Health care workers are exposed during medical procedures such as bronchoscopy, autopsy and intubation. Laryngeal tuberculosis is highly contagious. Prolonged close exposure to an infectious case may lead to infection of contacts. Direct invasion through mucous membranes or breaks in the skin may occur but is extremely rare. Bovine tuberculosis results from exposure to tuberculous cattle, usually by ingestion of unpasteurized milk or dairy products, and sometimes by airborne spread to farmers and animal handlers. Except for rare situations where there is a draining sinus, extrapulmonary tuberculosis (other than laryngeal) is generally not communicable.
4 :
TB is spread from one person to another through the air. The bacteria are ejected into the air when an infected person coughs or sneezes. People nearby breathe in the bacteria and become infected.
5 :
tuberculosis is spread by airborne particles, known as droplet nuclei, that can be generated when persons with pulmonary or laryngeal TB sneeze, cough, speak, or sing. Persons who share the same airspace with persons with TB disease are at greatest risk for infection. Infection occurs when a susceptible person inhales droplet nuclei containing tubercle bacilli, and these bacilli become established in the alveoli of the lungs and spread throughout the body

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