Mycobacterium tuberculosis (IMAGE)

University of Texas Health Science Center at San Antonio

Mycobacterium tuberculosis

Caption

TB is an infection of Mycobacterium tuberculosis (MTB). This bacterium usually first infects the lungs after airborne transmission. It is encased in a granuloma, a small area of inflammation, and for months or years, the body may be able to contain the infection. However, if the immune system weakens or something else affects the granuloma, MTB proliferates, and the patient usually develops signs and symptoms that can include fever, cough with or without sputum production, weight loss or fatigue.

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National Institute of Allergy and Infectious Diseases (NIAID)

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