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	~~'''Yersinia''' is a~~ genus of bacteria ~~in the family [[Yersiniaceae]]. Named after the Swiss bacteriologist Alexandre-Émile-John Yersin, it~~ includes ~~notable~~ species such as ''[[Yersinia pestis]]'', the causative agent of [[plague]], and ''[[Yersinia enterocolitica]]'' and ''[[Yersinia pseudotuberculosis]]'', both of which are responsible for various intestinal disorders.		{{Short description\|A genus of bacteria that includes several pathogenic species}}

	~~== History ==~~		[[File:Yersinia_pestis.jpg\|thumb\|right\|Yersinia pestis, the causative agent of the plague]]

	~~The genus~~ ''Yersinia'' ~~was first described in 1944 by French bacteriologists Eugène Louis Simon and André Urbain. The~~ genus ~~was named in honor~~ of ~~Alexandre~~-~~Émile-John Yersin~~, ~~who first isolated~~ ''Yersinia pestis'' ~~during~~ the [[~~Third Pandemic~~]] ~~of plague in Hong Kong in 1894~~.		'''Yersinia''' is a genus of [[Gram-negative bacteria]] belonging to the family [[Enterobacteriaceae]]. This genus includes several species that are pathogenic to humans, most notably ''[[Yersinia pestis]]'', the causative agent of [[plague (disease)\|plague]].

	== ~~Characteristics~~ ==		==Taxonomy==
			The genus ''Yersinia'' was named after the French bacteriologist [[Alexandre Yersin]], who discovered ''Yersinia pestis'' in 1894. The genus comprises several species, including:
			* ''[[Yersinia pestis]]''
			* ''[[Yersinia enterocolitica]]''
			* ''[[Yersinia pseudotuberculosis]]''

	''Yersinia'' species are Gram-negative, rod-shaped bacteria. They are facultative anaerobes, meaning they can grow in both the presence and absence of oxygen. Some species, such as ''Yersinia pestis'', are capable of living inside host cells, a characteristic that helps them evade the immune system.		==Pathogenic Species==

	== ~~Pathogenicity~~ ==		===Yersinia pestis===
			''Yersinia pestis'' is the most infamous species of the genus, known for causing the [[bubonic plague]], [[septicemic plague]], and [[pneumonic plague]]. It is transmitted to humans through the bite of infected [[fleas]] that live on [[rodents]]. The bacterium is characterized by its ability to survive and proliferate in the [[lymphatic system]], leading to the formation of swollen lymph nodes known as [[buboes]].

	~~Several species of~~ ''Yersinia'' ~~are pathogenic~~ in humans ~~and other animals~~. ~~The most well-known~~ is ~~''Yersinia pestis'', which causes plague. Other pathogenic species include ''Yersinia enterocolitica'', which causes gastroenteritis~~, and ~~''Yersinia pseudotuberculosis'', which~~ can cause ~~a variety of~~ symptoms ~~ranging from~~ fever and abdominal pain to ~~more serious conditions like septicemia~~.		===Yersinia enterocolitica===
			''Yersinia enterocolitica'' is a common cause of [[gastroenteritis]] in humans. It is transmitted through contaminated food and water, and it can cause symptoms such as [[diarrhea]], [[fever]], and [[abdominal pain]]. This species is notable for its ability to grow at low temperatures, which allows it to proliferate in refrigerated foods.

	== ~~Treatment and Prevention~~ ==		===Yersinia pseudotuberculosis===
			''Yersinia pseudotuberculosis'' is less common but can cause [[mesenteric lymphadenitis]], which mimics [[appendicitis]]. It is transmitted through contaminated food and water, similar to ''Yersinia enterocolitica''.

	~~Treatment for infections caused by~~ ''Yersinia'' species ~~typically involves antibiotics. Prevention strategies include good hygiene practices and~~, in the ~~case~~ of ~~plague~~, ~~control of rodent populations~~.		==Morphology and Physiology==
			''Yersinia'' species are [[facultative anaerobes]], meaning they can grow in both the presence and absence of [[oxygen]]. They are [[rod-shaped]] and exhibit [[bipolar staining]], which gives them a characteristic "safety pin" appearance under the microscope.

	== ~~See Also~~ ==		==Epidemiology==
			The distribution of ''Yersinia'' species varies globally. ''Yersinia pestis'' is primarily found in rural areas of Africa, Asia, and the Americas, where it persists in [[rodent]] populations. ''Yersinia enterocolitica'' and ''Yersinia pseudotuberculosis'' are more widespread and can be found in various environments, including soil, water, and animals.

			==Prevention and Control==
			Preventing infections caused by ''Yersinia'' species involves measures such as improving [[sanitation]], controlling [[rodent]] populations, and ensuring food safety. Vaccines are available for ''Yersinia pestis'', but they are primarily used for high-risk populations.

			==Related pages==
	* [[Bacteria]]		* [[Bacteria]]
	* [[Plague]]		* [[Plague (disease)]]
	* [[~~Gastroenteritis~~]]		* [[Enterobacteriaceae]]
	* [[~~Septicemia~~]]		* [[Infectious disease]]

	[[Category:~~Bacteria~~]]		[[Category:Yersinia]]
	[[Category:~~Yersiniaceae~~]]		[[Category:Enterobacteriaceae]]
	[[Category:~~Gram-negative~~ bacteria]]		[[Category:Pathogenic bacteria]]
	~~[[Category:Facultative anaerobes]]~~
	~~{{Bacteria-stub}}~~
	~~{{Medicine-stub}}~~

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'''Yersinia''' is a genus of bacteria in the family [[Yersiniaceae]]. Named after the Swiss bacteriologist Alexandre-Émile-John Yersin, it includes notable species such as ''[[Yersinia pestis]]'', the causative agent of [[plague]], and ''[[Yersinia enterocolitica]]'' and ''[[Yersinia pseudotuberculosis]]'', both of which are responsible for various intestinal disorders.

== History ==

The genus ''Yersinia'' was first described in 1944 by French bacteriologists Eugène Louis Simon and André Urbain. The genus was named in honor of Alexandre-Émile-John Yersin, who first isolated ''Yersinia pestis'' during the [[Third Pandemic]] of plague in Hong Kong in 1894.

== Characteristics ==

''Yersinia'' species are Gram-negative, rod-shaped bacteria. They are facultative anaerobes, meaning they can grow in both the presence and absence of oxygen. Some species, such as ''Yersinia pestis'', are capable of living inside host cells, a characteristic that helps them evade the immune system.

== Pathogenicity ==

Several species of ''Yersinia'' are pathogenic in humans and other animals. The most well-known is ''Yersinia pestis'', which causes plague. Other pathogenic species include ''Yersinia enterocolitica'', which causes gastroenteritis, and ''Yersinia pseudotuberculosis'', which can cause a variety of symptoms ranging from fever and abdominal pain to more serious conditions like septicemia.

== Treatment and Prevention ==

Treatment for infections caused by ''Yersinia'' species typically involves antibiotics. Prevention strategies include good hygiene practices and, in the case of plague, control of rodent populations.

== See Also ==

* [[Bacteria]]
* [[Plague]]
* [[Gastroenteritis]]
* [[Septicemia]]

[[Category:Bacteria]]
[[Category:Yersiniaceae]]
[[Category:Gram-negative bacteria]]
[[Category:Facultative anaerobes]]
{{Bacteria-stub}}
{{Medicine-stub}}

Yersinia - Revision history

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