Transmission (passing from person to person)

Covering the complex terminology of Tuberculosis and other assoicated disease
Post Reply
Site Admin
Posts: 54
Joined: Sun Jan 05, 2020 4:56 pm

Transmission (passing from person to person)

Post by auntiebi0tic » Thu Jan 09, 2020 3:20 pm

M. tuberculosis is carried in airborne particles, called droplet nuclei, of 1–5 microns in diameter. Infectious droplet nuclei are generated when persons who have pulmonary or laryngeal TB disease cough, sneeze, shout, or sing.

Depending on the environment, these tiny particles can remain suspended in the air for several hours. M. tuberculosis is transmitted through the air, not by surface contact.

Transmission occurs when a person inhales droplet nuclei containing M. tuberculosis, and the droplet nuclei traverse the mouth or nasal passages, upper respiratory tract, and bronchi to reach the alveoli of the lungs.
Drawing showing person to person transmission of tuberculosis droplets
Drawing showing person to person transmission of tuberculosis droplets
coughptop.jpeg (10.32 KiB) Viewed 876 times
The infectiousness of a person with TB disease is directly related to the number of tubercle bacilli that he or she expels into the air. Persons who expel many tubercle bacilli are more infectious than patients who expel few or no bacilli.
Young children with pulmonary and laryngeal TB disease are less likely than adults to be infectious. This is because children generally do not produce sputum when they cough.

However, transmission from children can occur. Therefore, children and adolescents with TB disease should be evaluated for infectiousness using the same criteria as adults. These criteria include presence of cough lasting 3 weeks or longer; cavitation on chest radiograph; or respiratory tract disease with involvement of lungs, airways, or larynx

Thx to CDC ... apter2.pdf

Post Reply