A throat swab was obtained from a patient with Streptococcal pharyngitis. What t

Question

A throat swab was obtained from a patient with Streptococcal pharyngitis. What type of hemolysis would be obtained on blood agar from the throat culture? a. Beta hemolysis b. Alpha hemolysis c. No hemolysis d. it can be either A or C The species of Streptococcus that causes pharyngitis or "Strep throat" is a. Streptococcus pneumonia b. Streptococcus agalactiae c. Streptococcus fascism d. Streptococcus pyogenes e. Streptococcus The pH indicator used in sugar formation tube is: a. Neutral red b. Methyl red c. Phenol red d. Bromothymol blue e. None of the above Kligler's Iron agar, because of its composition, can be used for which of the following applications? a. Testing for Hydrogen Sulfide production b. Testing for Glucose fermentation c. Testing for Lactose fermentation d. Can be used for all of the above A positive reaction for Citrate utilization will produce a color change a. From deep blue to green b. From red to yellow c. From colorless to red d. From green to deep blue Answer True (A) or False (B) to the following questions _________ A bacterial culture grown in Nitrate broth gives a red coloration on addition of Nitrate reagents A and B This indicates positive reaction for Nitrate oxidation _______Deaminases are enzymes responsible for degradation of proteins _________Phenol red produces a red color in alkaline pH _______Gas production during fermentation can be detected using the indicator Methyl red _________All members of the genus Staphylococci present as cocci in clusters _______ Pseudomonas aeruginosa is positive for Oxidase activity ________ Hydrogen Peroxide is the reagent of choice for detecting Oxidase activity _____ Streptococcus agalactiae is classified Group B beta hemolytic ______ Streptococcus pyogenes is classified as Group A alpha hemolytic _______ Staphylococcus aureus is both mannitol fermenting and coagulase positive

Explanation / Answer

16) beta hemolysis (a) is expected on blood agar from the throat culture of streptococcal pharyngitis patient.

17) Streptococcus pyogenes(d) is the causative agent of pharyngitis.

18) Phenol red (c) is the most commonly used pH indicator for the sugar fermentation test.

19) Kligler's iron agar is used for all of the following tests(d): testing hydrogen sulfide production, testing glucose fermentation and for testing lactose fermentation.

20) A positive reacrion of citrate utilization test resulting in the colour change of media from green to deep blue (d).

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