A coccobacillus plural coccobacilli is a type of bacterium with a shape intermediate between cocci spherical bacteria and bacilli rod-shaped bacteria1 Coccobacilli, then, are very short rods which may be mistaken for cocci Haemophilus influenzae, Gardnerella vaginalis, and Chlamydia trachomatis are coccobacilli Aggregatibacter actinomycetemcomitans is a Gram-negative coccobacillus prevalent in subgingival plaques Acinetobacter strains may grow on solid media as coccobacilli Bordetella pertussis is a Gram-negative coccobacillus responsible for causing whooping cough

Coxiella burnetti is also a coccobacillus2 Bacteria from the Brucella genus are medically important coccobacilli that cause brucellosis Haemophilus ducreyi, another medically important Gram-negative coccobacillus, is observed in sexually transmitted disease, chancroid, of Third World countries3


  1. ^ "Dorlands Medical Dictionary:coccobacillus" 
  2. ^ "persistent rickettsial disease" 
  3. ^ Schaetchter's Mechanisms of Microbial Disease 4th Edition ISBN 0-7817-5342-2

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