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A diplococcus (plural diplococci) is a round bacterium (a coccus) that typically occurs in the form of two joined cells. Examples are gram-negative Neisseria sp., ¨Haemophilus¨, ¨Acinetobacter¨ or ¨Brucella¨, and gram-positive Streptococcus pneumoniae or enterococcus.[1]

Its name comes from diplo, meaning double, and coccus, meaning berry.

In former times, a bacterial genus Diplococcus was recognized, but it is not used anymore.


  1. ^ Richard A. Harvey (Ph.D.) (2007). Microbiology. Lippincott Williams & Wilkins. pp. 395–. ISBN 978-0-7817-8215-9.