Progression from TB infection to overt TB disease occurs when the bacilli overcome the immune system defenses and begin to multiply. In primary TB disease (some 1–5% of cases), this occurs soon after the initial infection. However, in the majority of cases, a latent infection occurs with no obvious symptoms. These dormant bacilli produce active tuberculosis in 5–10% of these latent cases, often many years after infection.

The risk of reactivation increases with immunosuppression, such as that caused by infection with HIV. In people coinfected with M. tuberculosis and HIV, the risk of reactivation increases to 10% per year. Studies using DNA fingerprinting of M. tuberculosis strains have shown reinfection contributes more substantially to recurrent TB than previously thought, with estimates that it might account for more than 50% of reactivated cases in areas where TB is common. The chance of death from a case of tuberculosis is about 4% as of 2008, down from 8% in 1995.

Read more about Tuberculosis:  Epidemiology, History, Society and Culture, Research, In Other Animals

Other articles related to "tuberculosis":

Tuberculosis Cutis Orificialis
... Tuberculosis cutis orificialis (also known as "Acute tuberculous ulcer," and "Orificial tuberculosis") is a form of cutaneous tuberculosis that occurs at the mucocutaneous borders of the nose, mouth, anus ...
Stanisław Kuczborski
... As a student, he contracted tuberculosis and was referred to Warsaw University's Sanatorium in Zakopane ... to 1955, did he reside in Warsaw serving as the deputy director of the Tuberculosis Institute in Warsaw ... He was an honorary member of the International Union against Tuberculosis and Lung Disease located in Paris ...
Lichen Scrofulosorum
... Lichen scrofulosorum (also known as "Tuberculosis cutis lichenoides") is a rare tuberculid that presents as a lichenoid eruption of minute papules in ... This highlights its rarity and significance as an important marker of undetected tuberculosis ...
Alan L. Hart - Tuberculosis Research
... Hart devoted much of his career to research into and treatment of tuberculosis ... and Gibbus - were all in fact cases of tuberculosis (TB) ... Scientists had discovered in the nineteenth century that tuberculosis was not hereditary, but an airborne bacillus spread rapidly among persons in ...
Tuberculosis - In Other Animals
... The subspecies Mycobacterium tuberculosis, though, is rarely present in wild animals ... An effort to eradicate bovine tuberculosis caused by Mycobacterium bovis from the cattle and deer herds of New Zealand has been relatively successful ...

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