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Tuberculosis does not always settle in the lungs. If the outbreak of tuberculosis is in the brain, organs, kidneys, joints, or others areas, the patient may have active tuberculosis for an extended period of time before discovering that they are active. "A person with TB disease may feel perfectly healthy or may only have a cough from time to ...
Most people affected by TB do not have symptoms, and the disease is not active. This is called latent tuberculosis. [1] However, about 10% of latent infections progress to active disease, which, if left untreated, kills about half of those affected. [1]
Roughly one-quarter of the world's population has been infected with M. tuberculosis, [6] with new infections occurring in about 1% of the population each year. [11] However, most infections with M. tuberculosis do not cause disease, [169] and 90–95% of infections remain asymptomatic. [87] In 2012, an estimated 8.6 million chronic cases were ...
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 ...
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 .
Based on this, the study suggested that M. tuberculosis, like humans, evolved in Africa and subsequently spread with anatomically modern humans out of Africa across the world. By calibrating the mutation rate of M. tuberculosis to match this narrative, the study suggested that MTBC evolved 40,000–70,000 years ago. [ 59 ]
A tuberculoma is a clinical manifestation of tuberculosis which conglomerates tubercles into a firm lump, and so can mimic cancer tumors of many types in medical imaging studies. [1] [2] They often arise within individuals in whom a primary tuberculosis infection is not well controlled. [3]
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