A coccobacillus (plural coccobacilli) is a type of rod-shaped bacteria. The word coccobacillus reflects an intermediate shape between coccus (spherical) and bacillus (elongated).[1] Coccobacilli rods are so short and wide that they resemble cocci. Haemophilus influenzae and Chlamydia trachomatis are coccobacilli. Aggregatibacter actinomycetemcomitans is a gram-negative coccobacillus that is 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 coccobacillus.[2]

Bacteria from the Brucellae genus are medically important coccobacilli that cause brucellosis.

Haemophilus ducreyi is another medically important gram-negative coccobacillus and is observed in sexually transmitted disease, chancroid, of third-world countries.[3]


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  • coccobacillus — A short, thick bacterial rod of the shape of an oval or slightly elongated coccus. [G. kokkos, berry] * * * Coccobacillus n syn of PASTEURELLA * * * n. a rod shaped bacterium (bacillus) that is so small that it resembles a spherical bacterium… …   Medical dictionary

  • coccobacillus — /kok oh beuh sil euhs/, n., pl. coccobacilli / sil uy, sil ee/. Bacteriol. a spherelike bacillus. [COCC(US) + O + BACILLUS] * * * …   Universalium

  • coccobacillus — noun any bacillus that has a short oval shape …   Wiktionary

  • coccobacillus — n. type of bacteria …   English contemporary dictionary

  • coccobacillus — coc·co·bacillus …   English syllables

  • coccobacillus — n. a rod shaped bacterium (bacillus) that is so small that it resembles a spherical bacterium (coccus). Examples of such bacteria are Bacteroides and Brucella …   The new mediacal dictionary

  • coccobacillus — noun a bacterial cell intermediate in morphology between a coccus and a bacillus; a very short bacillus • Hypernyms: ↑eubacteria, ↑eubacterium, ↑true bacteria • Hyponyms: ↑Brucella * * * I. “+ noun …   Useful english dictionary

  • coccobacillary — 1. Relating to a coccobacillus. 2. Of organisms exhibiting coccal, bacillary, and intermediate forms. * * * coc·co·ba·cil·la·ry .käk (.)ō bas ə .ler ē, bə sil ə rē adj of, relating to, or being a coccobacillus <coccobacillary organisms> * * …   Medical dictionary

  • Gram-positive bacteria — Gram positive bacteria, stained purple, of both the bacillus (“rod shaped”) and coccus (spherical) forms.  A few Gram negative bacteria are also present, stained pink.  Numbered ticks are eleven (11) microns apart. Gram positive… …   Wikipedia

  • Félix d'Herelle — Born April 25, 1873 Montreal …   Wikipedia

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