A genus of gram-positive, facultatively anaerobic, coccoid bacteria. Its organisms occur singly, in pairs, and in tetrads and characteristically divide in more than one plane to form irregular clusters. Natural populations of Staphylococcus are membranes of warm-blooded animals. Some species are opportunistic pathogens of humans and animals.
Any of various spherical gram-positive bacteria including some that cause acute intestinal disturbances and infections.
A type of parasitic bacterium.
A spherical bacterium occurring in grapelike clusters.
A bacterium which grows in a bunch like a bunch of grapes, and causes boils and food poisoning.
The most important genus in the Micrococcaceae family, staphylococci are Gram-positive cocci growing in grape-like clusters, of both saprophytic and pathogenic types, commonly aerobic and non-capsulate. They are easy of cultivation, growing on non-specialized media, and in the presence of 8 -10 per cent sodium chloride. Species are classified primarily on the basis of coagulase tests as Staphylococcus pyogenes (or Staph, aureus), the type associated with suppurative infection and food poisoning, or Staphylococcus epidermis (or Staph, albus) a commensal form. The DNase and phosphatase tests (separate headings) are also employed for species identification. Other classifications (for epidemiological purposes) divide Staph, pyogenes by agglutination tests against protein antigens, and more particularly by phage typing.
Genus of spherical bacteria typically occurring in grapelike clusters; several species are pathogenic to humans, producing boils, some form of food poisoning, and other types of infection.
A class of bacterium that has a characteristic clumping quality similar to a cluster of grapes; causes pyrogenic infections.
A type of disease-causing bacteria that grow in the form of clusters resembling grapes. Common species include S aureus, S epidermidis, and S saprophyticus.
A genus of Gram-positive nonmotile spherical bacteria occurring in grapelike clusters. Some species are saprophytes, others parasites. Many species produce exotoxins. The species S. aureus is commonly present on skin and mucous membranes; it causes boils and internal abscesses. S. pyogenes albus and S. pyogenes aureus are associated with most suppurative infections. Other species produce toxins causing food poisoning.
A type of gram-positive bacterium which under the microscope appears in small masses like bunches of grapes. It is one of the most common infectious microorganisms and is found, for example, in the pus discharged from boils (furunculosis). Most respond to certain penicillins but there is great conern over resistant staphylococci (MRSA).
A genus of micrococci belonging to the family Micrococcaceae, order Eubacteriales. They are gram-positive and when cultured on agar produce white, yellow, or orange colonies. Some species are pathogenic, causing suppurative conditions and elaborating exotoxins destructive to tissues. Some produce enterotoxins and are the cause of a common type of food poisoning.
A group of bacteria, named for their appearance in clusters similar to grape bunches when grown on nutrient mediums. While there are various types of these bacteria, only a handful are harmful to humans.