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Staphylococcus aureus is a gram-positive spherically shaped bacterium, a member of the Bacillota, and is a usual member of the microbiota of the body, frequently found in the upper respiratory tract and on the skin. It is often positive for catalase and nitrate reduction and is a facultative anaerobe, meaning that it can grow without oxygen. [1]
S. epidermidis, a coagulase-negative staphylococcus species, is a commensal of the skin, but can cause severe infections in immune-suppressed patients and those with central venous catheters. S. saprophyticus , another coagulase -negative species that is part of the normal vaginal flora , is predominantly implicated in uncomplicated lower ...
The anterior nares are commonly infected by Staphylococcus aureus (also known as "golden staph") which may contribute to dermatitic skin lesions in patients with atopic dermatitis. [1] The anterior nares can act as a colonizing point from which the infection can spread. [ 2 ]
Staphylococcus species are facultative anaerobes (capable of growth both aerobically and anaerobically). [15] All species grow in the presence of bile salts. All species of Staphylococcus aureus were once thought to be coagulase-positive, but this has since been disproven. [16] [17] [18] Growth can also occur in a 6.5% NaCl solution. [15]
Anaerobic bacteria can also be isolated in about 35% of individuals who have nosocomial-acquired aspiration pneumonia [25] and pneumonia associated with tracheostomy with and without mechanical ventilation, [26] where they are often isolated along with Enterobacteriaceae, Pseudomonas spp. and Staphylococcus aureus. It is important that ...
Methicillin-resistant Staphylococcus aureus (MRSA) is a group of gram-positive bacteria that are genetically distinct from other strains of Staphylococcus aureus. MRSA is responsible for several difficult-to-treat infections in humans. It caused more than 100,000 deaths worldwide attributable to antimicrobial resistance in 2019.
A nasopharyngeal swab is a device used for collecting a sample of nasal secretions from the back of the nose and throat. [ 1 ] [ 2 ] The sample is then analyzed for the presence of organisms or other clinical markers for disease.
In the field of molecular biology, enterotoxin type B, also known as Staphylococcal enterotoxin B (SEB), is an enterotoxin produced by the gram-positive bacteria Staphylococcus aureus. It is a common cause of food poisoning , with severe diarrhea , nausea and intestinal cramping often starting within a few hours of ingestion. [ 1 ]