Helicobacter - Revision history

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	'''Helicobacter''' ~~is a~~ [[~~genus~~]] of [[Gram-negative bacteria]], possessing a characteristic ~~helical~~ shape~~. They have been found to colonize various parts of the [[gastrointestinal tract]] of mammals, including humans~~. The most well-known species ~~within~~ this genus is ''[[Helicobacter pylori]]'', which is ~~recognized for its role in causing~~ [[~~peptic ulcers~~]], [[~~chronic gastritis~~]]~~, and is associated with~~ the ~~development of~~ [[~~gastric cancer~~]] and ~~[[MALT lymphoma]]~~.		{{Short description\|Genus of bacteria}}
			{{Taxobox
			\| name = ''Helicobacter''
			\| image = Helicobacter_sp_01.jpg
			\| image_caption = ''Helicobacter'' species
			\| domain = [[Bacteria]]
			\| phylum = [[Campylobacterota]]
			\| classis = [[Epsilonproteobacteria]]
			\| ordo = [[Campylobacterales]]
			\| familia = [[Helicobacteraceae]]
			\| genus = '''''Helicobacter'''''
			\| genus_authority = [[Goodwin]] ''et al.'' 1989
			}}

			'''''Helicobacter''''' is a genus of [[Gram-negative bacteria]] possessing a characteristic spiral shape. The most well-known species of this genus is ''[[Helicobacter pylori]]'', which is associated with [[gastritis]] and [[peptic ulcers]] in humans. ''Helicobacter'' species are known for their ability to colonize the [[gastrointestinal tract]] of various mammals and birds.

	==Characteristics==		==Characteristics==
	Helicobacter species ~~are typically 0.5 to 5 micrometers in length, with a helical shape that is believed to help them penetrate the mucous lining of the stomach. They~~ are microaerophilic, meaning they require oxygen ~~but~~ at lower levels than ~~are~~ present in the atmosphere. ~~These bacteria~~ are ~~also characterized by their ability~~ to ~~produce~~ [[~~urease~~]], ~~an enzyme that breaks down urea~~ to ~~ammonia, neutralizing~~ stomach ~~acid and allowing them~~ to ~~survive~~ in ~~highly acidic environments~~.		''Helicobacter'' species are microaerophilic, meaning they require oxygen at lower levels than is present in the atmosphere. They are motile due to the presence of multiple [[flagella]], which allow them to navigate the mucus lining of the stomach. The spiral shape of these bacteria is thought to aid in their movement through the viscous environment of the gastric mucosa.

	==~~Pathogenesis~~==		==Pathogenicity==
	~~The pathogenesis of~~ ''Helicobacter pylori'' ~~involves colonization~~ of ~~the~~ gastric ~~mucosa, leading to damage and inflammation~~. The ~~bacteria~~'s ~~urease activity is critical for its survival~~ in the acidic ~~gastric~~ environment~~. Once established, ''H. pylori'' can cause a chronic infection, leading to conditions such as gastritis and peptic ulcers. The chronic inflammation induced by~~ the ~~infection can also contribute~~ to ~~the development~~ of ~~gastric cancer~~ and ~~MALT lymphoma~~.		[[File:Helicobacter_sp_01.jpg\|''Helicobacter'' species\|thumb\|right]]
			''Helicobacter pylori'' is the most studied species within this genus and is a major cause of [[peptic ulcer disease]] and [[gastric cancer]]. The bacterium's ability to survive in the acidic environment of the stomach is attributed to its production of [[urease]], an enzyme that neutralizes stomach acid by converting [[urea]] into [[ammonia]] and [[carbon dioxide]].

	~~==Diagnosis and Treatment==~~		Other species of ''Helicobacter'' have been identified in animals and are associated with various gastrointestinal diseases. For example, ''Helicobacter hepaticus'' is linked to liver disease in mice, and ''Helicobacter mustelae'' is known to cause gastritis in ferrets.
	~~Diagnosis~~ of ''Helicobacter ~~pylori~~'' ~~infection can be made through various methods, including [[urea breath test]], [[stool antigen test]], [[serology]],~~ and ~~[[endoscopy]]~~ with ~~biopsy~~. ~~Treatment typically involves a combination of antibiotics~~ to ~~eradicate the bacteria~~ and ~~proton pump inhibitors~~ to ~~reduce stomach acid, known as triple therapy~~.

	==~~Epidemiology~~==		==Ecology==
	''Helicobacter ~~pylori~~'' ~~is one~~ of the ~~most common bacterial infections worldwide~~, ~~with a higher prevalence~~ in ~~developing countries. Transmission~~ is ~~believed to occur through oral-oral or fecal-oral routes~~, and ~~infection is more common in crowded living conditions and where sanitation is poor~~.		''Helicobacter'' species are adapted to colonize the mucosal surfaces of the gastrointestinal tract. They are found in a wide range of hosts, including humans, domestic animals, and wildlife. The ability of these bacteria to persist in the stomach environment is facilitated by their unique adaptations, such as the production of urease and their motility.

	==~~Other Helicobacter Species~~==		==Diagnosis and Treatment==
	~~While~~ ''Helicobacter ~~pylori~~'' is the ~~most studied species~~, ~~other species within this genus have also been identified~~ and ~~associated with gastrointestinal and liver diseases in animals and humans~~. ~~These~~ include ''[[~~Helicobacter cinaedi~~]]'' and ''[[~~Helicobacter hepaticus~~]]~~'', among others~~.		Diagnosis of ''Helicobacter'' infections typically involves non-invasive tests such as the [[urea breath test]], stool antigen tests, and serological tests. Invasive methods include endoscopy with biopsy for [[histological]] examination and [[culture]].

	~~==Prevention==~~		Treatment of ''Helicobacter pylori'' infection usually involves a combination of [[antibiotics]] and [[proton pump inhibitors]] to eradicate the bacteria and reduce stomach acid production, respectively. Common antibiotic regimens include [[clarithromycin]], [[amoxicillin]], and [[metronidazole]].
	~~Prevention~~ of ''Helicobacter pylori'' infection ~~is challenging due~~ to ~~its widespread nature and unclear transmission routes. Improvements in sanitation~~ and ~~living conditions are believed to~~ reduce ~~transmission rates~~. ~~Currently~~, ~~there is no vaccine available for ''H. pylori''~~, ~~but research in this area is ongoing~~.

	==~~See Also~~==		==Research and Implications==
	* [[Gastroenterology]]		Research on ''Helicobacter'' has expanded our understanding of the role of bacteria in gastrointestinal diseases. The discovery of ''H. pylori'' and its link to peptic ulcers revolutionized the treatment of these conditions, shifting the focus from acid suppression alone to bacterial eradication.
	* [[Microbiology]]
	* [[Infectious disease]]

	[[~~Category:Bacteria~~]]		==Related pages==
	[[~~Category:Gastroenterology~~]]		* [[Helicobacter pylori]]
	[[~~Category:Infectious diseases~~]]		* [[Gastritis]]
			* [[Peptic ulcer disease]]
			* [[Gastric cancer]]

	~~{{Medicine-stub}}~~		[[Category:Helicobacter\| ]]
	~~<gallery>~~
	~~File~~:Helicobacter ~~sp 01.jpg~~\|~~Helicobacter~~
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	~~File:Helicobacter sp 01.jpg\|Helicobacter~~
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New page

'''Helicobacter''' is a [[genus]] of [[Gram-negative bacteria]], possessing a characteristic helical shape. They have been found to colonize various parts of the [[gastrointestinal tract]] of mammals, including humans. The most well-known species within this genus is ''[[Helicobacter pylori]]'', which is recognized for its role in causing [[peptic ulcers]], [[chronic gastritis]], and is associated with the development of [[gastric cancer]] and [[MALT lymphoma]].

==Characteristics==
Helicobacter species are typically 0.5 to 5 micrometers in length, with a helical shape that is believed to help them penetrate the mucous lining of the stomach. They are microaerophilic, meaning they require oxygen but at lower levels than are present in the atmosphere. These bacteria are also characterized by their ability to produce [[urease]], an enzyme that breaks down urea to ammonia, neutralizing stomach acid and allowing them to survive in highly acidic environments.

==Pathogenesis==
The pathogenesis of ''Helicobacter pylori'' involves colonization of the gastric mucosa, leading to damage and inflammation. The bacteria's urease activity is critical for its survival in the acidic gastric environment. Once established, ''H. pylori'' can cause a chronic infection, leading to conditions such as gastritis and peptic ulcers. The chronic inflammation induced by the infection can also contribute to the development of gastric cancer and MALT lymphoma.

==Diagnosis and Treatment==
Diagnosis of ''Helicobacter pylori'' infection can be made through various methods, including [[urea breath test]], [[stool antigen test]], [[serology]], and [[endoscopy]] with biopsy. Treatment typically involves a combination of antibiotics to eradicate the bacteria and proton pump inhibitors to reduce stomach acid, known as triple therapy.

==Epidemiology==
''Helicobacter pylori'' is one of the most common bacterial infections worldwide, with a higher prevalence in developing countries. Transmission is believed to occur through oral-oral or fecal-oral routes, and infection is more common in crowded living conditions and where sanitation is poor.

==Other Helicobacter Species==
While ''Helicobacter pylori'' is the most studied species, other species within this genus have also been identified and associated with gastrointestinal and liver diseases in animals and humans. These include ''[[Helicobacter cinaedi]]'' and ''[[Helicobacter hepaticus]]'', among others.

==Prevention==
Prevention of ''Helicobacter pylori'' infection is challenging due to its widespread nature and unclear transmission routes. Improvements in sanitation and living conditions are believed to reduce transmission rates. Currently, there is no vaccine available for ''H. pylori'', but research in this area is ongoing.

==See Also==
* [[Gastroenterology]]
* [[Microbiology]]
* [[Infectious disease]]

[[Category:Bacteria]]
[[Category:Gastroenterology]]
[[Category:Infectious diseases]]

{{Medicine-stub}}