People born in areas where TB is common.Close contacts with people with infectious TB.Examine medical history, x-rays, and sputum.Red welt around injection indicates infection.PPD injected in forearm and examined 2-3 days.Bacilli remain confined in tubercles for years.Initial infection controlled by immune system.Bacilli break out of tubercles in alveoli and.Infected macrophages separate and form tubercles.Macrophages attack bacteria, but some survive.Breath in infected air and bacilli go to lungs.
Spreads through the air when a person with active.Damages a persons lungs or other parts of the.Caused by Mycobacterium tuberculosis (also called.
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