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Tuberculosis (TB), also known colloquially as the "white death", or historically as consumption, [7] is a contagious disease usually caused by Mycobacterium tuberculosis (MTB) bacteria. [1] Tuberculosis generally affects the lungs, but it can also affect other parts of the body. [1]
In people who develop active TB of the lungs, also called pulmonary TB, the TB skin test will often be positive. In addition, they will show all the signs and symptoms of TB disease, and can pass the bacteria to others. So, if a person with TB of the lungs sneezes, coughs, talks, sings, or does anything that forces the bacteria into the air ...
If and when a person’s immune system becomes compromised, like with AIDS or with aging, the Ghon focus can become reactivated, and the infection can spread to either one or both upper lobes of the lungs, it’s thought that this is because oxygenation is greatest in these areas, and TB being an aerobe, prefers areas of greater oxygenation.
Resistant strains of M. tuberculosis have developed resistance to more than one TB drug, due to mutations in their genes. In addition, pre-existing first-line TB drugs such as rifampicin and streptomycin have decreased efficiency in clearing intracellular M. tuberculosis due to their inability to effectively penetrate the macrophage niche. [31]
If these second-line drugs are prescribed or taken incorrectly, further resistance can develop leading to XDR-TB. Resistant strains of TB are already present in the population, so MDR-TB can be directly transmitted from an infected person to an uninfected person. In this case a previously untreated person develops a new case of MDR-TB.
TB Tvøroyri (Tvøroyrar Bóltfelag), a Faroese football club from Tvøroyri; tailback, a sub-position of Halfback (American football); Tampa Bay Buccaneers, a professional American football team in the Tampa Bay Area
A large number of people who survived tuberculosis still experience symptoms such as breathlessness and coughing. Although the severity is not well understood, some people have reduced quality of life and exercise capacity. [4] [2] In severe cases, people may experience hospitalizations and death related to respiratory causes. [2]
The medical history includes obtaining the symptoms of pulmonary TB: productive, prolonged cough of three or more weeks, chest pain, and hemoptysis.Systemic symptoms include low grade remittent fever, chills, night sweats, appetite loss, weight loss, easy fatiguability, and production of sputum that starts out mucoid but changes to purulent. [1]