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细菌
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===杆菌===
[[ File:T0151ec9db527764231Img342421332.jpg|缩略图|居中|250px|[httphttps://p9image.qhimgso.com/t0151ec9db527764231.jpgview?sizeq=%E6%9D%86%E8%8F%8C&src=srp&correct=%E6%9D%86%E8%8F%8C&ancestor=list&cmsid=392ff655e2d6cc396b1d4a7b3758c25e&cmras=6&cn=0&gn=0&kn=50&fsn=130&adstar=0&clw=1066x1600 254#id=d1c2b48ad7c38609b3992a956226abf7&currsn=0&ps=90&pc=90 原圖鏈接][http://shspro.qihooso.com/pcsearchthrow/api/midpage/90f16875c7a284027throw?cotals=s112c46189d&lm_extend=ctype:3&ctype=3&q=%E6%9D%86%E8%8F%8C&rurl=http%3A%2F%2Fwww.hudong.com%2Fwiki%2F%25E4%25B8%2599%25E6%25B0%259F%25E5%2593%258C%25E9%2585%25B8%3Fprd%3Dcitiao_right_xiangguancitiao&img=http%3A%2F%2Fa1.att.hudong.com%2F31%2F75%2F01300000259246122771755975832_s.jpg&key=t01c3987533c207bd60.jpg&s=1 1578651349216 来自 光发娱乐科学网]]]
外形为杆状的细菌称杆菌，常有长宽接近的短杆或球杆状菌，如甲烷短杆菌属(Methano—brevibacter)；长宽相差较大的棒杆状或长杆状菌，如枯草芽孢杆菌(Bacillus subtilis)、梭状杆菌(Bacterium fusiformis)；分枝状或叉状菌，如双歧杆菌属(Bifidobacterium)；竹节状(两端平截)，如炭疽芽孢杆菌(Bacillusanthracis)等。