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Tubercle bacilli continues to multiply. It forms droplet nuclei, and gets out of the body into the air.

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A common treatment for the TB is taking antibiotics for six months. The antibiotics kills bacteria by preventing them from making substances to form cell walls.

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MDR is a type of drug resistant TB. It is transmitted in the same way, and it is no more infectious than drug-susceptible TB. However, the delay in recognition in the body and the prolonged period of infection increase the resistance. XDR is a rare case of MDR, and it is less likely to be cured.

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The bacilli spread to other organs through lymphatic channels (vessels that help to maintain fluid balance) or bloodstream

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Patient displays symptoms such as cough, fever, and weight loss.

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If the immune system cannot keep the bacilli under control, the bacilli multiply rapidly. It breaks out of the granuloma.

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The macrophages ingests extracellular bacilli, which triggers white blood cells to ingest most of the bacilli and forms granuloma. It can be detected by tuberculin skin test. The person do not have TB disease and cannot spread the bacteria to others.

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This is an illustration of the granuloma formed around the bacterium. The white cells are macrophages.

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In 2-8 weeks, immune cells called macrophages surround the tubercle bacilli, forming a barrier shell called a granuloma. The macrophages ingest the bacterium.

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The is a detailed picture of the structure within the lungs.

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This picture shows how tuberculosis is transmitted. The red dots represents bacilli nuclei.

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Once the bacterium gets to the alveoli, it starts to multiply.

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This is a picture of the M. tuberculosis. It is a type of bacilli, a rod-shaped bacteria.

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The Bacterium go through mouth or nasal passages, arrives at the upper respiratory tract and bronchi, reaching the alveoli of the lungs (where gas exchange happens).
A small amount of bacilli enters the blood stream could spread to other organs, such as the brain, larynx, lymph node, lung, spine, bone, or kidney.

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Even 10 bacteria can initiate an infection!

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Mycobacterium tuberculosis (MTB) is the bacteria pathogen of tuberculosis. They are in the form of prokaryote cells, meaning that the do not have a nucleus. MTB is contained in the nuclei of bacilli droplets, forming an airborne particle. MTB organisms are also called tubercle bacilli.