Coccobacillus

Coxiella burnetii

A coccobacillus (plural coccobacilli) is a type of bacterium with a shape intermediate between cocci (spherical bacteria) and bacilli (rod-shaped bacteria).^[1] 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 coccobacillus.^[2] 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 countries.^[3]

References

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

Microbiology: Bacteria

Medical
microbiology

Biochemistry
and ecology

Oxygen preference	Aerobic Obligate Anaerobic Facultative Obligate Microaerophile Nanaerobe Aerotolerant

Other	Microbial metabolism Primary nutritional groups Nitrogen fixation Microbial ecology Human flora Gut flora Skin flora Vaginal flora Substrate preference Lipophilic Saccharophilic

Morphology:
Shapes

Morphology:
Structures

Cell envelope	Cell membrane Cell wall: Peptidoglycan NAM NAG DAP Gram-positive bacteria only: Teichoic acid Lipoteichoic acid Endospore Gram-negative bacteria only: Bacterial outer membrane Porin Lipopolysaccharide Periplasmic space Mycobacteria only: Arabinogalactan Mycolic acid

Outside envelope	Bacterial capsule Slime layer S-layer Glycocalyx Pilus Fimbria

Composite	Biofilm

Bacterial
taxonomy

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