Mycobacterial diseases

Mycobacterial diseases

Diseases caused by mycobacteria, a diffuse group of acid-fast, rod-shaped bacteria in the genus Mycobacterium. The two most important species are M. tuberculosis (the cause of tuberculosis) and M. leprae (the cause of leprosy); other species have been called by several names, particularly the atypical mycobacteria or the nontuberculous mycobacteria. See Leprosy, Tuberculosis

These bacteria are classified according to their pigment formation, rate of growth, and colony morphology. The most commonly involved disease site is the lungs. Nontuberculous mycobacteria are transmitted from natural sources in the environment, rather than from person to person, and thus are not a public health hazard. The diagnosis of disease caused by nontuberculous mycobacteria can be difficult, since colonization or contamination of specimens may be present rather than true infection. Pulmonary disease resembling tuberculosis is a most important manifestation of disease caused by nontuberculous mycobacteria. The symptoms and chest x-ray findings are similar to those seen in tuberculosis. Mycobacterium kansasii and M. avium intracellulare are the most common pathogens. The disease usually occurs in middle-aged men and women with some type of chronic coexisting lung disease. The pathogenic mechanisms are obscure. Pulmonary infections due to M. kansasii can be treated successfully with chemotherapy. The treatment of pulmonary infections due to M. avium intracellulare complex is difficult.

Chronic infection involving joints and bones, bursae, synovia, and tendon sheaths can be caused by various species.

Localized abscesses due to M. fortuitum or M. chelonei can occur after trauma, after surgical incision, or at injection sites. The usual treatment is surgical incision. The most common soft tissue infection is caused by M. marinum, which may be introduced, following an abrasion or trauma, from handling fish or fish tanks, or around a swimming pool. Treatment is surgical. Mycobacterium ulcerans causes a destructive skin infection in tropical areas of the world. It is treated by wide excision and skin grafting.

Disseminated M. avium intracellulare is one of the opportunistic infections seen in the acquired immune deficiency syndrome (AIDS). In individuals with AIDS, the organism has been cultured from lung, brain, cerebrospinal fluid, liver, spleen, intestinal mucosa, and bone marrow. No treatment has yet been effective in this setting. See Acquired immune deficiency syndrome (AIDS)

References in periodicals archive ?
This case report provides lessons for the understanding of mycobacterial diseases.
tuberculosis isolates: The study was performed in the National JALMA Institute for Leprosy & Other Mycobacterial Diseases, Agra.
Kiran Katoch, Director, National JALMA Institute for Leprosy and Other Mycobacterial Diseases, Agra; Dr.
Authors of the earlier study said their finding "might provide new tools to combat mycobacterial diseases such as tuberculosis by preventing the disease itself and/or its transmission by spores.
He serves as advisor to the WHO Global Stop TB Partnership, CDC TB Training and Educational Network, and the Mahatma Gandhi Institute for Medical Sciences in India in the fields of TB and AIDS-related mycobacterial Diseases.
Professor Wolinsky's forte was mycobacterial diseases, and Dave developed a close interest in these diseases, which he maintains to this day.
Others detail the positional identification of genes underlying complex traits in domestic animals, mycobacterial diseases, computational advances in multi-sequence alignment, the principles of microRNA function in vertebrate physiology and human disease, repetitive sequences in complex genomes, glycosylation disorders, annotating noncoding RNA genes, chromatin and gene expression, multistage sampling for genetic studies, and ethical and legal issues relating to biobanks.
Caution should be exercised when interpreting HIV-1 ELISA and WB data from regions where leprosy or other mycobacterial diseases (i.
The paper concluded that, due to an unexpectedly high rate of false positives on both the ELIZA and Western Blot tests, these standard antibody tests "may not be sufficient for HIV diagnosis in AIDS-endemic areas of Central Africa where the prevalence of mycobacterial diseases is quite high.
The major clinical spectrum of mycobacterial diseases is caused by tuberculosis (TB) and nontuberculous mycobacteria (NTM).