【军团菌属】
军团菌是一类革兰氏阴性菌，包括造成退伍军人症的嗜肺军团菌。
军团菌在许多环境中都很常见，已确定的至少有50个种和70个血清型。该属菌细胞壁取代基所携带的基团标识了其体抗原。这些取代基的化学构成，包括其成分的不同以及糖原的不同排列方式，决定了其表面体抗原或是O-抗原的性质，而这正是血清学中对许多革兰氏阴性菌分类的基本手段。
军团菌的名字源于1976年7月在费城爆发的一种“神秘疾病”，该病共造成221人患病，34人死亡，患者大都为美国退伍军人，因而被冠名为退伍军人症。退伍军人症被广泛宣传而造成一定程度的恐慌。1977年1月18日，该病的病原体被确定为一种不为人知的细菌，随后被命名为军团菌。
==下属物种==
* Legionella adelaidensis Benson et al. 1991
* Legionella anisa Gorman et al. 1985
* Legionella beliardensis Lo Presti et al. 2001
* Legionella birminghamensis Wilkinson et al. 1988
* Legionella bozemanae corrig. (Garrity et al. 1980) Brenner et al. 1980
* Legionella bozemanii (Garrity et al. 1980) Brenner et al. 1980，拼写错误
* Legionella brunensis Wilkinson et al. 1989
* Legionella busanensis Park et al. 2003
* Legionella cardiaca Pearce et al. 2012
* Legionella cherrii Brenner et al. 1985
* Legionella cincinnatiensis Thacker et al. 1989
* Legionella drancourtii La Scola et al. 2004
* Legionella dresdenensis Lück et al. 2010
* Legionella drozanskii Adeleke et al. 2001
* Legionella dumoffii Brenner et al. 1980
* Legionella erythra Brenner et al. 1985
* Legionella fairfieldensis Thacker et al. 1991
* Legionella fallonii Adeleke et al. 2001
* Legionella feeleii Herwaldt et al. 1984
* Legionella geestiana Dennis et al. 1993
* Legionella gormanii Morris et al. 1980
* Legionella gratiana Bornstein et al. 1991
* Legionella gresilensis Lo Presti et al. 2001
* Legionella hackeliae Brenner et al. 1985
* Legionella impletisoli Kuroki et al. 2007
* Legionella israelensis Bercovier et al. 1986
* Legionella jamestowniensis Brenner et al. 1985
* Legionella jordanis Cherry et al. 1982
* Legionella lansingensis Thacker et al. 1994
* Legionella londiniensis Dennis et al. 1993
* Legionella longbeachae McKinney et al. 1982
* Legionella lytica (Drozanski 1991) Hookey et al. 1996
* Legionella maceachernii Brenner et al. 1985
* Legionella massiliensis Campocasso et al. 2012
* Legionella micdadei (Garrity et al. 1980) Hébert et al. 1980
* Legionella moravica Wilkinson et al. 1989
* Legionella nagasakiensis Yang et al. 2012
* Legionella nautarum Dennis et al. 1993
* Legionella norrlandica Rizzardi et al. 2015
* Legionella oakridgensis Orrison et al. 1983
* Legionella parisiensis Brenner et al. 1985
* Legionella pittsburghensis Pasculle et al. 1980，异名
* Legionella pneumophila Brenner et al. 1979 (Approved Lists 1980)
* Legionella qingyii Wu et al. 2019
* Legionella quateirensis Dennis et al. 1993
* Legionella quinlivanii Benson et al. 1990
* Legionella rowbothamii Adeleke et al. 2001
* Legionella rubrilucens Brenner et al. 1985
* Legionella sainthelensi Campbell et al. 1984
* Legionella santicrucis Brenner et al. 1985
* Legionella saoudiensis Bajrai et al. 2016
* Legionella septentrionalis Li et al. 2021
* Legionella shakespearei Verma et al. 1992
* Legionella spiritensis Brenner et al. 1985
* Legionella steelei Edelstein et al. 2012
* Legionella steigerwaltii Brenner et al. 1985
* Legionella taurinensis Lo Presti et al. 1999
* Legionella thermalis Ishizaki et al. 2016
* Legionella tucsonensis Thacker et al. 1990
* Legionella tunisiensis Campocasso et al. 2012
* Legionella wadsworthii Edelstein et al. 1983
* Legionella waltersii Benson et al. 1996
* Legionella worsleiensis Dennis et al. 1993
* Legionella yabuuchiae Kuroki et al. 2007