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Tuberculosis of the lungs may also occur via infection from the blood stream. This is known as a Simon focus and is typically found in the top of the lung. [ 91 ] This hematogenous transmission can also spread infection to more distant sites, such as peripheral lymph nodes, the kidneys, the brain, and the bones.
Tuberculosis (or TB) is an infectious disease, usually caused by Mycobacterium tuberculosis bacteria. [1] TB generally affects the lungs , but can also affect other parts of the body. [ 1 ]
Mycobacterium tuberculosis is the most common cause of both pulmonary tuberculosis and tuberculous lymphadenitis. [1] [6] Historically, transmission of Mycobacterium bovis from dairy consumption was another frequent cause of tuberculous lymphadenitis, but incidence has drastically decreased in developed countries since the advent of pasteurization and other efforts to prevent bovine ...
Tuberculosis spreads through the air from one person to another. Someone with an active infection can put the germs into the air when they cough, speak, or sing. Those germs can hang out in the ...
Globally, tuberculosis is likely the most common infectious cause of lung cavities. [6] Less commonly, parasitic infections can cause cavities. [5] Viral infections almost never cause lung cavities; in a small study of immunocompromised patients with a lung infection, the presence of a cavity on CT scan essentially ruled out viral infection.
CDC_Tuberculosis_(TB)_Transmission_and_Pathogenesis_Video.webm (WebM audio/video file, VP8/Vorbis, length 1 min 42 s, 640 × 360 pixels, 1.27 Mbps overall) This is a file from the Wikimedia Commons .
Other causes can include acid reflux, asthma, allergies, or other chronic medical conditions, adds Richard Watkins, M.D., an infectious disease physician and professor of medicine at the Northeast ...
Symptoms of M. tuberculosis include coughing that lasts for more than three weeks, hemoptysis, chest pain when breathing or coughing, weight loss, fatigue, fever, night sweats, chills, and loss of appetite. M. tuberculosis also has the potential of spreading to other parts of the body. This can cause blood in urine if the kidneys are affected ...