彎曲菌屬（學名：Campylobacter），又名曲狀桿菌屬或彎曲桿菌屬，是一種革蘭氏陰性細菌的屬[1]。曲狀桿菌屬的型態就是折曲了的一般桿菌，呈「逗號」狀或Ｓ字型[1]。
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本屬絕大多數物種均為病原體，而且可感染人類及其他動物。家禽是本屬細菌的天然儲積所[2][3]：人類進食了受彎曲菌污染的肉食亦會同樣受細菌感染致病。另一種感染途徑是接觸過受細菌感染的動物[4]。本屬物種有至少12種可引致人類生病，當中以空腸彎曲菌（C. jejuni）及大腸彎曲菌（C. coli）最為常見[5]。空腸彎曲菌是腸胃炎的主要成因，即使在已發展國家亦如是[5][6]。空腸彎曲桿菌感染也可以傳播到愛滋病患者的血液中，而C. lari是兒童復發性腹瀉的已知原因[4]。胎兒彎曲桿菌（C. fetus）是造成家牛和綿羊自然流產的其中一種原因，也是人類的機會性病原體[7]。
本屬已被發現屬於唾液微生物組的一種[8]。
綜合各個來源，以下詳列本屬各物種：[9]
- Campylobacter avium Rossi et al., 2009
- 加拿大彎曲菌 Campylobacter canadensis Inglis et al., 2007
- 大腸彎曲菌 Campylobacter coli (Doyle, 1948) Veron & Chatelain, 1973
- 簡明彎曲菌 Campylobacter concisus Tanner et al., 1981
- Campylobacter corcagiensis Koziel et al., 2014
- Campylobacter cuniculorum Zanoni et al., 2009
- 屈曲彎曲菌 Campylobacter curvus (Tanner et al., 1984) Vandamme et al., 1991，曲形彎曲桿菌
- Campylobacter devanensis [10]
- 胎兒彎曲桿菌 Campylobacter fetus (Smith & Taylor, 1919) Sebald & Véron, 1963，胚胎彎曲桿菌
- 胚胎彎曲桿菌胚胎亞種 Campylobacter fetus fetus
- 胚胎彎曲桿菌性病亞種 Campylobacter fetus venerealis
- Campylobacter geochelonis Piccirillo et al., 2016
- 纖細彎曲桿菌 Campylobacter gracilis (Tanner et al., 1981) Vandamme et al., 1995
- 瑞士彎曲菌 Campylobacter helveticus Stanley et al., 1993
- Campylobacter hepaticus Van et al., 2016
- 人彎曲桿菌 Campylobacter hominis Lawson et al., 2001
- 豬腸彎曲菌 Campylobacter hyoilei Alderton et al. 1995
- 豚腸彎曲桿菌 Campylobacter hyointestinalis Gebhardt et al., 1985
- 空腸彎曲桿菌德萊亞種 Campylobacter jejuni doylei
- 空腸彎曲桿菌空腸亞種 Campylobacter jejuni jejuni
- Campylobacter iguaniorum Gilbert et al., 2015
- 海象彎曲桿菌 Campylobacter insulaenigrae Foster, Holmes, Steigerwalt, Lawson, Thorne, Byrer, Ross, Xerry, Thompson & Collins, 2005[11]
- 空腸彎曲菌 Campylobacter jejuni (Jones et al., 1931) Veron & Chatelain, 1973
- 拉尼爾彎曲桿菌 Campylobacter lanienae Logan et al., 2000
- 海鷗彎曲菌 Campylobacter lari ，紅嘴鷗彎曲桿菌
- 紅嘴鷗彎曲桿菌UPTC變種 Campylobacter lari UPTC
- 海鳥彎曲桿菌 Campylobacter laridis
- Campylobacter lawrenceae 2004[11]
- Campylobacter lawsonii
- Campylobacter majalis Lynch et al. 2022[12]
- 黏膜彎曲菌 Campylobacter mucosalis (Lawson et al., 1981) Roop et al., 1985，黏膜彎曲桿菌
- 黃褐彎曲桿菌 Campylobacter mustelae
- 硝化彎曲桿菌 Campylobacter nitrofigilis
- Campylobacter ornithocola Cáceres et al., 2017
- Campylobacter peloridis Debruyne et al., 2009
- Campylobacter pinnipediorum Gilbert et al. 2017
- Campylobacter porcelli [10]
- 幽門螺桿菌 Campylobacter pylori Marshall et al. 1985，幽門彎曲菌，為Helicobacter pylori (Marshall et al. 1985) Goodwin et al. 1989的異名
- 直腸彎曲菌 Campylobacter rectus (Tanner et al., 1981) Vandamme et al., 1991，直腸彎曲桿菌
- 昭和彎曲菌 Campylobacter showae Etoh et al., 1993，昭和彎曲桿菌
- 唾液彎曲菌 Campylobacter sputorum (Prévot, 1940) Véron & Chatelain, 1973，痰液彎曲桿菌
- 唾液彎曲桿菌牛生物變種 Campylobacter sputorrum bubulus
- 唾液彎曲桿菌糞生物變種 Campylobacter sputorrum fecalis
- Campylobacter subantarcticus Debruyne et al., 2010
- Campylobacter suis Lynch et al. 2022
- Campylobacter taeniopygiae Bryant et al. 2021
- Campylobacter troglodytis Kaur et al. 2023
- 烏普薩拉彎曲菌 Campylobacter upsaliensis Sandstedt & Ursing, 1991，烏普薩拉彎曲桿菌
- Campylobacter ureolyticus (Jackson & Goodman, 1978) Vandamme et al., 2010
- Campylobacter vicugnae [10]
- Campylobacter volucris Debruyne et al., 2010
- Campylobacter vulpis Parisi et al. 2021
Vandamme, Peter; Dewhirst, Floyd E.; Paster, Bruce J.; On, Stephen L.W. Garrity, George; Brenner, Don J.; Staley, James T.; Krieg, Noel R.; Boone, David R.; DeVos, Paul; Goodfellow, Michael; Rainey, Fred A.; Schleifer, Karl-Heinz , 編. Bergey's Manual of Systematic Bacteriology: Volume Two: The Proteobacteria (Part C) 2nd. Springer Science & Business Media. 2006: 1147–1160. ISBN 978-0-387-29298-4 （英語）. Moore, John E.; Corcoran, Deborah; Dooley, James S.G.; Fanning, Séamus; Lucey, Brigid; Matsuda, Motoo; McDowell, David A.; Mégraud, Francis; Millar, B.; O'Mahony, Rebecca; O'Riordan, Lisa; O'Rourke, Michele; Rao, Juluri R.; Rooney, Paul J.; Sails, Andrew; Whyte, Pau. Campylobacter. Veterinary Research. 2005, 36 (3): 351–82. PMID 15845230. doi:10.1051/vetres:2005012 （英語）. Sauerwein, R. W.; Horrevorts, A. M.; Bisseling, J. Septic abortion associated with Campylobacter fetus subspecies fetus infection: Case report and review of the literature. Infection. 1993, 21 (5): 331–333. PMID 8300253. doi:10.1007/BF01712458 （英語）. Wang, Kun; Lu, Wenxin; Tu, Qichao; Ge, Yichen; He, Jinzhi; Zhou, Yu; Gou, Yaping; Nostrand, Joy D Van; Qin, Yujia; Li, Jiyao; Zhou, Jizhong; Li, Yan; Xiao, Liying; Zhou, Xuedong. Preliminary analysis of salivary microbiome and their potential roles in oral lichen planus. Scientific Reports. 2016-03-10, 6 (1) [2017-05-06]. Bibcode:2016NatSR...622943W. PMC 4785528 
. PMID 26961389. doi:10.1038/srep22943. （原始內容存檔於2023-01-02）. Lynch C, Peeters C, Walsh N, McCarthy C, Coffey A, Lucey B, Vandamme P. Campylobacter majalis sp. nov. and Campylobacter suis sp. nov., novel Campylobacter species isolated from porcine gastrointestinal mucosa. Int J Syst Evol Microbiol 2022; 72:5510.
