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Which applies best here?
An 11-year-old girl presents with 3 days of a sore throat, painful swallowing, and sore swollen lumps under her jaw. The ER doctor finds an elevated temperature, enlarged red tonsils with white exudates, and several tender lymph nodes in the anterior cervical areas.



A. Treatment of acute pharyngitis with penicillin or other effective antibiotic is indicated to prevent acute rheumatic fever
B. Group A streptococci are susceptible to inhibition by bacitracin in the “A” disk on blood agar plate
C. Streptolysin O is the virulence factor of group A streptococcus responsible for evoking a protective immune response and for causing acute rheumatic fever.
D. Rapid antigen detection test for group A streptococcus is a more sensitive test for streptococcal pharyngitis than a throat culture.
Asked by ORTIZ, Last updated: Mar 29, 2020

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1 Answer

John Smith

John Smith

Answered Sep 09, 2016

Group a streptococci are susceptible to inhibition by bacitracin in the “a” disk on blood agar plate-bacitracin can be used to distinguish streptococcus pyogenes from other bacteria, with s. pyogenes being sensitive to bacitracin and others resistant. in this case bacitracin is used to distinguish s. pyogenes from other -hemolytic streptococci. streptococcus pyogenes is a spherical, gram-positive bacterium that is the cause of group a streptococcal infections.s. pyogenes displays streptococcal group a antigen on its cell wall. s. pyogenes typically produces large zones of beta-hemolysis (the complete disruption of erythrocytes and the release of hemoglobin) when cultured on blood agar plates, and are therefore also called group a (beta-hemolytic) streptococcus
 

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