Acid-fast bacilli (AFB) (shown in red) are tubercle bacilli Mycobacterium tuberculosis.
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Tuberculosis

Tuberculosis (commonly shortened to TB) is an infection caused by the bacterium Mycobacterium tuberculosis, which most commonly affects the lungs (pulmonary TB) but can also affect the central nervous system (meningitis), lymphatic system, circulatory system (Miliary tuberculosis), genitourinary system, bones and joints. more...

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Tuberculosis is the most common major infectious disease today, infecting two billion people or one-third of the world's population, with nine million new cases of active disease annually, resulting in two million deaths, mostly in developing countries.

Most of those infected (90 percent) have asymptomatic latent TB infection (LTBI). There is a 10 percent lifetime chance that LTBI will progress to active TB disease which, if left untreated, will kill more than 50 percent of its victims. TB is one of the top three infectious killing diseases in the world: HIV/AIDS kills 3 million people each year, TB kills 2 million, and malaria kills 1 million.

The neglect of TB control programs, HIV/AIDS, and immigration has caused a resurgence of tuberculosis. Multiple drug resistant strains of TB (MDR-TB) are emerging. The World Health Organization declared TB a global health emergency in 1993.

Other names for the disease

  • TB (short for tuberculosis and also for Tubercle Bacillus)
  • Consumption (TB seemed to consume people from within with its symptoms of bloody cough, fever, pallor, and long relentless wasting)
  • Wasting disease
  • White plague (TB sufferers appear markedly pale)
  • Phthisis (Greek for consumption) and phthisis pulmonalis
  • Scrofula (swollen neck glands)
  • King's evil (so called because it was believed that a king's touch would heal scrofula)
  • Pott's disease of the spine
  • Miliary TB (x-ray lesions look like millet seeds)
  • Tabes mesenterica (TB of the abdomen)
  • Lupus vulgaris (the common wolf - TB of the skin)
  • Prosector's wart, also a kind of TB of the skin, transmitted by contact with contaminated cadavers to anatomists, pathologists, veterinarians, surgeons, butchers, etc.

The bacterium

The cause of tuberculosis, Mycobacterium tuberculosis (MTB), is a slow-growing aerobic bacterium that divides every 16 to 20 hours. This is extremely slow compared to other bacteria, which tend to have division times measured in minutes (among the fastest growing bacteria is a strain of E. coli that can divide roughly every 20 minutes). It is not classified as either Gram-positive or Gram-negative because it does not have the chemical characteristics of either, although it contains peptidoglycan in their cell wall. If a Gram stain is performed, it stains very weakly Gram-positive or not at all. It is a small rod-like bacillus which can withstand weak disinfectants and can survive in a dry state for weeks but, spontaneously, can only grow within a host organism (in vitro culture of M. tuberculosis took a long time to be achieved, but is nowadays a normal laboratory procedure).

Read more at Wikipedia.org


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Worldwide, tuberculosis (TB) is one of the most common causes of death among persons infected with human immunodeficiency virus (HIV) (1). The World ...
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In the 1980s, after a steady decline during preceding decades, there was a resurgence in the rate of tuberculosis in the United States that coincided ...
Diet influences tuberculosis outcome
Twenty-one HIV-negative adults with newly diagnosed pulmonary tuberculosis were hospitalized for 8 weeks and randomly assigned to receive a cholesterol-rich ...
Clinical characteristics and treatment responses of tuberculosis in patients with malignancy receiving anticancer chemotherapy
Study objectives: The aim of this study was to elucidate the clinical characteristics and treatment responses of tuberculosis developing in patients ...
Thoracic complications in tuberculosis and diabetes patients
PURPOSE: To determine the prevalence of thoracic complications among pulmonary tuberculosis and diabetes patients in comparison with patients with tuberculosis ...
Change of IL-12 and TNF-alpha productions measured by whole blood culture in tuberculosis patients after treatment
PURPOSE: Tuberculosis is one of the leading infectious diseases in adults, causing around 3 million deaths annually. Research on understanding the host ...
Pulmonary and pleural tuberculosis in extreme elderly
PURPOSE: Several publications about tuberculosis in elderly patients have suggested that their clinical presentation and clinical course might be atypical ...

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