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

Is the breakdown of RBC.

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

Perfectly spherical cells about 1 micrometer in diameter

converts fibrinogen to fibrin and coagulates plasma.

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

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

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

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

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

What are the biochemical test

Catalase-negative.

promotes attachment to blood clots and traumatized tissue adhesin

Virulence factors of staphylococcus aureus.

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

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

A toxin that specifically acts on polymorphonuclear leukocytes.

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

It is often hemolytic on blood agar

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

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

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

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

Catalase-positive

This forms a large yellow colony on rich medium

Vigorous catalase-producers

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

This enzyme clots the plasma component of blood

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