All of the following statements are true regarding Staphylococci except
S.epidermidis is the most common cause of CoNS infections in humans.it is invariably present on the normal human skin. It can cause disease when the host defenses are breached. It is a common cause of stitch abscess. it has a predilection for growth on implanted foreign bodies such as aificial hea valves, shunts, intravascular catheters, and prosthetics appliances, leading to bacteremia.hospital strains of s.epidermidis are usually multidrug-resistant. it can cause cystitis and central line-associated bloodstream infection{BSI) endocarditis may be caused, paicularly in drug addicts. Coagulase-negative staphylococci constitute a major component of the normal flora of the human body. Biofilm formation is an impoant factor in the pathogenesis of infection by S.epidermidis. It is an extracellular matrix that protects bacteria from antibacterial agents and helps in colonization and resistance to infections. Ref: Textbook of Microbiology; Ananthanarayanan and Panicker; Tenth Edition; Page No: 208
A majority of infections caused by coagulase-negatively Staphylococci are due to Staphyloccus epidermis
b-lactamase production in Staphylococci is under plasmid control
Expression of methicillin resistance in Staphylococcus aureus increases when it is incubated at 37 oC on blood agar
Methicillin resistance in Staphylococcus aureus is independent of b-lactamase production
Bacteriology