Perfectly spherical cells about 1 micrometer in diameter

Grow in clusters because staphylococci divide in two planes (True/False)

Vigorous catalase-producers

What are the biochemical test

Is an enzyme that breaks H2O2 into H2O and O2 and the bubbling that is seen is due to evolution of O2 gas.

Catalase-positive

Catalase-negative.

Are enzymes that clot blood plasma by a mechanism that is like normal clotting

The coagulase test identifies whether an organism produces this exoenzyme (True/False)

This enzyme clots the plasma component of blood

The only significant disease-causing bacteria of humans that produce coagulase enzyme is Staphylococcus aureus. (True/False)

This enzyme is a good indicator of the pathogenic potential of S. aureus

Is the breakdown of RBC.

The ability of bacterial colonies to induce hemolysis when grown on blood agar is used to classify certain microorganisms.

S. aureus, the most common cause of ”staph infections”, is frequently hemolytic on BA (True/False)

The bacteria in the colonies capable of fermenting the mannitol in the medium to acid, cause a change of color.

This forms a large yellow colony on rich medium

It is often hemolytic on blood agar

They are facultative anaerobes that grow by aerobic respiration or by fermentation that yields principally lactic acid.

Can grow at a temperature range of 15 to 45 degrees and at NaCl concentrations as high as 15 percent.

Nearly all strains of S. aureus produce the enzyme coagulase. Only S. aureus is coagulase-positive among the Staphylococcus. (True/False)

Virulence factors of staphylococcus aureus.

promotes attachment to blood clots and traumatized tissue adhesin

converts fibrinogen to fibrin and coagulates plasma.

A surface protein of S. aureus, which binds IgG molecules by their Fc region

A toxin that specifically acts on polymorphonuclear leukocytes.

cause diarrhea and vomiting when ingested and are responsible for staphylococcal food poisoning.

is expressed systemically and is the cause of toxic shock syndrome (TSS)

causes the scalded skin syndrome in neonates, which results in widespread blistering and loss of the epidermis