coccus

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coccus

 [kok´us] (pl. coc´ci) (L.)
a spherical bacterium, usually slightly less than 1 μ in diameter, belonging to the Micrococcaceae family. It is one of the three basic forms of bacteria, the other two being bacillus (rod-shaped) and spirillum (spiral-shaped). A pathogenic coccus can almost always be classified as either a staphylococcus (occurring in clusters), or a streptococcus (occurring in short or long chains). Both staphylococci and streptococci are gram-positive and do not form spores.

The staphylococci are responsible for many serious infections, especially Staphylococcus aureus, which is the causative agent in boils, abscesses, osteomyelitis, and a large variety of other infections. Staphylococci have received much attention in recent years because of the ability of most strains to develop a resistance to antibiotics.

The most dangerous streptococci are those of the beta-hemolytic type. Various species of streptococci cause sore throat, scarlet fever, mastoiditis, and septicemia.
Cocci.

coc·cus

, pl.

coc·ci

(kok'ŭs, kok'sī), Avoid mispronouncing the plural form kok'ī.
1. A bacterium of round, spheroid, or ovoid form.
2. Synonym(s): cochineal
[G. kokkos, berry]

coccus

(kŏk′əs)
n. pl. cocci (kŏk′sī, kŏk′ī)
A bacterium having a spherical or spheroidal shape.

coc′cal (kŏk′əl) adj.

coc·cus

, pl. cocci (kokŭs, -sī)
1. A bacterium of round, spheroid, or ovoid form.
2. Synonym(s): cochineal.
[G. kokkos, berry]

coccus

A common type of spherical or spheroidal bacterium. Cocci connected in line are called STREPTOCOCCI; those in bunches are called STAPHYLOCOCCI.

coccus

a bacterium having a spherical or globular form.

coc·cus

, pl. cocci (kokŭs, -sī)
A bacterium of round, spheroid, or ovoid form.
[G. kokkos, berry]
References in periodicals archive ?
** "Gram-positive cocci in clusters (presumptive Staphylococcus)";
Activity of linezolid against gram-positive cocci: a multicentre study in Greek hospitals.
A report of "many Gram-negative rods" or "moderate Gram-positive cocci suggestive of staphylococci" helps determine whether empiric antibiotics will be effective.
Zithromax is quite effective against gram-positive cocci. He regards it as an excellent drug for prophylaxis in cases of recurrent cellulitis.
On hospital day 2, blood cultures grew gram-positive cocci in pairs and chains (Figure).
Abscess-forming inflammatory granulation tissue with gram-positive cocci and prominent eosinophil infiltration in cats: possible infection of methicillin-resistant Staphylococcus.
Bacteraemia was caused by gram-negative rods in 42 patients (84.9%) and gram-positive cocci in 8 patients (15.1%).
Tissue culture from secretions from both patients showed gram-positive cocci in clusters on the Gram stain, and subsequent cultures yielded MRSA.
Infections due to gram-positive cocci, such as Staphylococcus aureus, particularly methicillin resistant S.
The emergence of gram-positive cocci including MRSA and VRE that acquire the 16S rRNA methylase could also be a grave clinical matter, although fortunately no such hazardous microbes have been identified.
Vegetations from the resected material showed numerous polymorphonuclear neutrophils and gram-positive cocci on microscopic examination.

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