Mycobacterium tuberculosis

Mycobacterium tuberculosis affects the lungs, though it may also affect other areas of the human body, like the kidneys, brain, or spine.
Mycobacterium tuberculosis

Tuberculosis is a curable and preventable infectious disease caused by the bacteria Mycobacterium tuberculosis, which is transmitted by air. Tuberculosis normally affects the lungs, though it may also affect other areas of the human body, like the kidneys, brain, or spine. Only individuals with pulmonary tuberculosis transmit the disease.

Mycobacteria are a group of bacteria that constitute among the very serious health issues globally. Three classes can be described within the genus Mycobacterium:

  1. Tuberculosis complex that generates tuberculosis and is composed of the species M. tuberculosis, M. bovis (such as M. bovis BCG), M. africanum and M. microti;
  2. M. leprae that creates leprosy;
  3. Additional non-tuberculous mycobacteria (MOTT- from English Mycobacteria other than tuberculosis) which are opportunistic and create non-tuberculous images without pathogenic power.

The isolation of MOTT is frequent and its distinction from the M. tuberculosis complex is of clinical and public health significance, because they specify the isolation of their patients in particular rooms of their health centres and the analysis of their patient’s contacts.

Tuberculosis remains one of the key causes of death in adults globally. Based on statistics from the World Health Organization, annually 8 million people develop active TB globally and almost 2 million perish. The incidence and severity of disease is significantly more significant in patients coinfected with the Human Immunodeficiency Virus (HIV).

Clinical features

Many human infections contribute to latent, asymptomatic disease. Between 5 and 10 percent of Individuals who do not receive therapy during latent TB disease Can advance to an active illness which, if left untreated, can infect 10 to 15 people per year.

The signs of active tuberculosis will be dependent on where mycobacteria grow in the body. General symptoms of tuberculosis include fatigue, weight loss, fever, and night sweats. Active pulmonary tuberculosis may lead to breathing problems, chest pain, and bloody expectoration. The indicators of tuberculosis in different areas of the body are based on the affected region or organ.

Identification and Diagnosis

The first diagnosis of tuberculosis is vital to control the disorder so as to disrupt the chain of transmission. The microbiological diagnosis of tuberculosis disease has traditionally been based on direct microscopic examination and culture. However, microscopic examination of sputum has a moderate sensitivity and involving 5,000-10,000 bacilli per milliliter of sample are necessary for detection. Additionally, a negative result doesn’t eliminate the disease, hence the samples are often processed for subsequent farming and verification of the identification. The culture of this sample allows to raise the sensitivity of this analysis, the typing of this research as well as the progression of drug susceptibility studies. But, its main drawback is that the slow development of mycobacteria, which leads to the civilization result to be postponed up to 6-8 months prior to perfecting a sample as negative. After obtaining a positive culture, identification of M. tuberculosis by classical or molecular microbiology methods remains crucial. Molecular methods based on direct sample nucleic acid amplification permit early detection and higher sensitivity which offer benefits over the standard methods mentioned previously. Furthermore, these methods may be utilised in grown civilizations such as species identification, in addition to detection of genetic mutations associated with resistance to significant antibiotics.

A method called Spoligotyping has been researched for detection Tuberculosis. The method uses PCR techniques to recognize the complex. The method uses a DNA polymorphism which is present at an exact chromosomal locus, the Direct Repeat (DR) region, which is one in every Mycobacterium tuberculosis complex bacteria.


In the majority of circumstances, tuberculosis can be treated by following proper antibiotic therapy. Tuberculosis may be treated by taking a variety of drugs over a span of 6 to 12 weeks. It’s essential that the individual ill with tuberculosis take all medicines as prescribed, because when therapy is tight, immunity of the bacillus into the medication may occur and the individual might become sick again, thereby depriving other people. In such cases we talk of drug-resistant tuberculosis (MDR-TB); a distinctive kind of tuberculosis that doesn’t respond to traditional therapies with first-line medication, being harder and costly to deal with. Remedy for MDR-TB demands using specific drugs which could produce substantial side effects from the individual. Improper treatment of those cases can have life threatening results for your individual.

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