Miért fordul elő a fogyás a tb-ben

Pulmonalis tuberculosis radiológiája

miért fordul elő a fogyás a tb-ben

Scanning electron micrograph of M. In nature, the bacterium can grow only within the cells of a host organism, but M. Since MTB retains certain miért fordul elő a fogyás a tb-ben even after being treated with acidic solution, it is classified as an acid-fast bacillus.

The M. The latter two species are classified as " nontuberculous mycobacteria " NTM. Transmission When people with active pulmonary TB cough, sneeze, speak, sing, or spit, they expel infectious aerosol droplets 0. A single sneeze can release up to 40, droplets. After about two weeks of effective treatment, subjects with nonresistant active infections generally do not remain contagious to others.

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Infection susceptibility Tobacco smoking increases the risk of infections in addition to increasing the risk of active disease and death. Additional factors increasing infection susceptibility include: young age children.

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During this process, the bacterium is enveloped by the macrophage and stored temporarily in a membrane-bound vesicle called a phagosome. The phagosome then combines with a lysosome to create a phagolysosome. In the phagolysosome, the cell attempts to use reactive oxygen species and acid to kill the bacterium.

miért fordul elő a fogyás a tb-ben

However, M. The primary site of infection in the lungs, known as the " Ghon focus ", is generally located in either the upper part of the lower lobe, or the lower part of the upper lobe.

This is known as a Simon focus and is typically found in the top of the lung.

A belgyógyászat alapjai 1.

Macrophagesepithelioid cellsT lymphocytesB lymphocytesand fibroblasts aggregate to form granulomas, with lymphocytes surrounding the infected macrophages. When other macrophages attack the infected macrophage, they fuse together to form a giant multinucleated cell in the alveolar lumen. The granuloma may prevent dissemination of the mycobacteria and provide a local environment for interaction of cells of the immune system.

Macrophages and dendritic cells in the granulomas are unable to present antigen to lymphocytes; thus the immune response is suppressed.

miért fordul elő a fogyás a tb-ben

Another feature of the granulomas is the development of abnormal cell death necrosis in the center of tubercles. To the naked eye, this has the texture of soft, white cheese and is termed caseous necrosis. Tissue destruction and necrosis are often balanced by healing and fibrosis.

During active disease, some of these cavities are joined miért fordul elő a fogyás a tb-ben the air passages bronchi and this material can be coughed up. It contains living bacteria, and thus can spread the infection. Treatment with appropriate antibiotics kills bacteria and allows healing to take place.

miért fordul elő a fogyás a tb-ben

Upon cure, affected areas are eventually replaced by scar tissue. However, the difficult culture process for this slow-growing organism can take two to six weeks for blood or sputum culture.

A tuberkulózis előfordulása és okai

Effective TB treatment is difficult, due to the unusual structure and chemical composition of the mycobacterial cell wall, which hinders the entry of drugs and makes many antibiotics ineffective. Shorter treatment regimen may be recommended for those with compliance issues.

miért fordul elő a fogyás a tb-ben

A person with fully susceptible MTB may develop secondary acquired resistance during therapy because of inadequate treatment, not taking the prescribed regimen appropriately lack of complianceor using low-quality medication. Extensively drug-resistant TB is also resistant to three or more of the six classes of second-line drugs.

miért fordul elő a fogyás a tb-ben