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Pseudomonas is a bacterium commonly found in the environment: in animals, humans, and soil. The most common type causing infections in humans is called Pseudomonas aeruginosaPseudomonas often invades tissue and causes infection. Specifically, Pseudomonas aeruginosa is the most virulent strain of Pseudomonas organisms. It can colonize on open wounds, causing infections, abscesses, and sepsis, with edema and/ or discoloration of the skin.

Pseudomonas aeruginosa have been found to survive within droplet nuclei and can remain in aerosols for long periods of time with evidence of potential airborne transmission. Contact with contaminated water is also a mode of transmission. Routes that pose the greatest health risk are broken skin exposure and lung exposure from inhaling aerosols. The bacteria can often enter the body through injuries and wounds. The incubation period varies according to infection site and type. Pseudomonas can survive for months on surfaces and objects. Certain strains have been found to be able to grow in disinfectant solutions. Isopropyl alcohol 4% v/v or ethyl alcohol 6% v/v are effective disinfectants for this organism when used appropriately.

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