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coccus
(redirected from Gram-positive cocci)

   Also found in: Medical, Wikipedia, Hutchinson 0.02 sec.

coccus

Spherical bacterium. Many species have characteristic arrangements that are useful in identification. Pairs of cocci are called diplococci; rows or chains, streptococci (see streptococcus); grapelike clusters, staphylococci (see staphylococcus); packets of eight or more cells, sarcinae; and groups of four cells in a square arrangement, tetrads. These characteristic groupings occur as a result of variations in the reproduction process.


coccus [′käk·əs]
(microbiology)
A form of eubacteria which are more or less spherical in shape.


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Microscopic examination of the fluid revealed Gram-positive cocci in chains, and cultures were positive for Streptococcus pneumoniae (penicillin MIC--0.
2) Reid et al studied the composition of obstructing material in Shah tympanostomy tubes and found that it was made up of an eosinophilic coagulum that contained a polymorphonuclear leukocyte infiltrate, erythrocytes, and some gram-positive cocci.
Gram stains were prepared on all isolates to verify the presence of gram-positive cocci.
 
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