what is the mode of transmission of tuberculosis
Answers
Tuberculosis (TB) is transmitted from an infected person to a susceptible person in airborne particles, called droplet nuclei. These are 1–5 microns in diameter. These infectious droplet nuclei are tiny water droplets with the bacteria that are released when persons who have pulmonary or laryngeal tuberculosis cough, sneeze, laugh, shout etc. These tiny droplet nuclei remain suspended in the air for up to several hours. Tuberculosis bacteria, (Mycobacterium tuberculosis) however are transmitted through the air, not by surface contact. This means touching cannot spread the infection unless it is breathed in.
Transmission occurs when a person inhales droplet nuclei containing tuberculosis bacteria. These droplet nuclei travels via mouth or nasal passages and move into the upper respiratory tract. Thereafter they reach the bronchi and ultimately to the lungs and the alveoli.