Evolution of Mycobacterium Tuberculosis and Public Health

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Magnified 20,000X, this colorized scanning electron micrograph (SEM) depicts a grouping of methicillin resistant Staphylococcus aureus (MRSA) bacteria. See PHIL 617 for a black and white view of this image. Phoro credit: CDC.

By Alyssa Gest

Mycobacterium Tuberculosis (TB) is a species of pathogenic bacteria that is one of the world's leading bacterial pathogens. It is a gram-positive bacterium that attacks the lungs but can spread to other parts of the body and cause further damage to important organs. This includes lymph nodes, bones, kidneys, the brain, the spine and even the skin. From the lungs, the bacteria will move through the blood or lymphatic systems to reach other regions of the body. Although this bacteria is a pathogen, not everyone will experience symptoms who get infected. Those who have weaker immune systmes are more at risk for developing serious illnesses including young children and babies. Others with underlying conditions such as HIV, kidney disease, organ transplants, etc. are also at higher risk of death. It can be easily spread from person to person through the air and surfaces. They begin to colonize in the lungs through small air sacs and rapidly move through the low and small airways. They are very small, ranging from 0.2–0.5 µm wide and 2–4 µm long, allowing them to slip through the airways and move through the bloodstream.

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Legend/credit: Magnified 20,000X, this colorized scanning electron micrograph (SEM) depicts a grouping of methicillin resistant Staphylococcus aureus (MRSA) bacteria. Photo credit: CDC. Every image requires a link to the source.
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Authored for BIOL 238 Microbiology, taught by Joan Slonczewski,at Kenyon College,2024