Infectious Diseases - 1 Answers
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1 :
It can be passed via respiratory droplets.
2 :
Tuberculosis, otherwise known as TB, is highly infectious, if a person has an "active" case. It is easily spread through a cough, a sneeze or through spit. It only takes one droplet to be exposed, from a cough that may expel 40,000 droplets. Although one third of the population may have latent TB, meaning "non-active" TB, only 10% will become "active" or contagious. If untreated, one person can infect 10-15 people per year, depending upon the strength of the strain of bacteria, the exposure time, and the effectiveness of ventilation. Half of all active, untreated cases result in death. Positive cases which are known to be active, must be isolated. The U.S. has only 5-10% while Asia and Africa have 80% of all positive TB cases, and new infections occur at the rate of one per second, 25,000 new cases each year in the U.S. 40% of those cases are from immigrants from endemic countries. This information was gathered from Wikipedia. You can view this at http://en.wikipedia.org/wiki/Tuberculosis
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