A urine Gram stain shows gram positive cocci in clusters. The organism tested catalase positive. To speciate this organism from culture, the technician shouldperform a coagulase test ans a/an:

A. polymyxin B suceptibility

B. novobiacin suceptibility

C. oxidase

D. beta lactamase 

B. novobiocin suseptibility

The gram stain from a blood culture shows gram positive cocci in chains. No growth occurs on blood agar plates incubated both aerobically and anaerobically. Additional testing should be done to detect the presence of:

A. Staphylococcus saprophyticus

B. Areococcus urinae

C. Abiotrophia defectiva

D. Streptococcus pneumoniae  

C. Abiotrophia defectiva

Viridans streptpcocci can be differentiated from Streptococcus pneumoniae by:

A. alpha hemolysis

B. morphology

C. caralase reaction

D. bile solubility

A reliable test for distinguishing Staphylococcus aureus from other staphylococci is:

A. oxidase

B. coagulase

C. catalase

D. optochin suceptibility

The optochin ( ethylhydrocupreine hydrocloride) disc is used for the identification of:

A. Haemophilus influenzae

B. group A beta hemolytic streptococci

C. Streptococcus pneumoniae

D. alpha hemolytic streptococci 

In the optochin suceptibility test, if there is a zone of inhibitionof 19-30mm surrounding the disc following overnight incubation at 37C, the colony most likely consists of:

A. staphylococci

B. streptococci

C. pneumococci

D. intestional bacilli

Which two diseases are usually preceded by infection with beta hemolytic streptococci:

A. rheumatic fever, undulant fever

B. glomerulonephritis, rheumatic fever

C. rheumatic fever, tularemia

D. glomerulonephritis, undulant fever 

The enterotoxin produced by certain stains of hemolytic, coagulase positive Staphylococcus aureus:

A. is destroyed by boiling for 15-30 minutes

B. is identical to the demonecrotic toxin

C. causes one type of bacterial food poisoning

D. is highly antigenic

A gamma hemolytic Streptococcus that blackens bile esculin agar but does not grow in 6.5% NaCl broth is most likely:

A. group B Streptococcus

B. Enterococcus

C. group D Streptococcus

D. Streptococcus pneumoniae

Gram stain examination from a blood culture bottle shows dark blue, spherical organisms in clusters. Growth on sheep blood agar shows small, round, pale yellow colonies. Further tests should include:

A. catalase production and coagulase test

B. bacitracin suseptibility and serological typing

C. oxidase and deoxyribonuclease reactions

D. Voges-Proskauer and methyl red

"Nutritionally deficent" steptococci are:

A. enterococci

B. group D nonenterococci

C. cell wall deficient streptococci

D. in the genera Granulicatella and Abiotrophia