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Staphylococcus aureus is a facultative anaerobic Gram-positive coccus and a member of the normal skin flora as well as the nasal passages of humans. S. aureus is also the etiological agent of suppurative abscesses, as first described by Sir Alexander Ogston in 1880.
4 ημέρες πριν · The term staphylococcus, generally used for all the species, refers to the cells’ habit of aggregating in grapelike clusters. Staphylococci are microbiologically characterized as gram-positive (in young cultures), non-spore-forming, nonmotile, facultative anaerobes (not requiring oxygen).
Bacteria in the genus Staphylococcus are pathogens of man and other mammals. Traditionally they were divided into two groups on the basis of their ability to clot blood plasma (the coagulase reaction). The coagulase-positive staphylococci constitute the most pathogenic species S aureus.
Become familiar with the speciation of the genus Staphylococcus. Grow and identify different staphylococci species using selective and differential agar; Identify the 3 hemolytic types on blood agar.
Staphylococci are Gram-positive spherical bacteria about 1 micrometer in diameter, which divide in two planes and, therefore, grow in clusters; they are nonmotile, nonspore-forming, and have a genome size of between 2000 and 3000 kbp, with a 30–39% GC-content.
Staphylococcus aureus (S. aureus), a gram positive cocci, is a major human pathogen causing large variety of infections worldwide and predominates in surgical wound infections with prevalence rate ranging from 4.6%-54.4% [1] – [5].
Staphylococcus aureus is a catalase and coagulase-producing gram-positive organism that frequently occurs in human nasal passages, mucous membranes, or skin of carriers. It is traditionally identified by its characteristic golden yellow grapelike clumped colonies on culture (staphule – Greek for grapes; aureus – Latin for gold) (Fig. 2).
