WBR0291

Author	[[PageAuthor::Ogheneochuko Ajari, MB.BS, MS [1] (Reviewed by Yazan Daaboul, M.D.)]]
Exam Type	ExamType::USMLE Step 1
Main Category	MainCategory::Microbiology, MainCategory::Pathophysiology
Sub Category	SubCategory::General Principles, SubCategory::Infectious Disease
Prompt	[[Prompt::A 28-year-old woman presents to the physician's office with complaints of fever, sore throat, and swelling in her axilla. Her temperature is 38.3 °C (101 °F), her blood pressure is 136/86 mmHg, and her heart rate is 100/min. Physical examination is remarkable for axillary lymphadenopathy. A throat swab is performed and sent for culture. Two days later, a gram-positive club-shaped rod that contains metachromatic granules forms black colonies on tellurite agar. What is the mechanism of virulence that characterizes the organism responsible for this patient's condition?]]
Answer A	AnswerA::It binds to MHC II and T-cell receptor, resulting in polyclonal T-cell activation
Answer A Explanation	AnswerAExp::
Answer B	AnswerB::It acts via antibodies to M proteins to enhance the host defenses
Answer B Explanation	AnswerBExp::
Answer C	AnswerC::It inhibits protein synthesis via ADP ribosylation of EF-2
Answer C Explanation	AnswerCExp::
Answer D	AnswerD::It blocks GABA and glycine release from cells in the spinal cord
Answer D Explanation	AnswerDExp::
Answer E	AnswerE::It produces catalase to degrade hydrogen peroxide
Answer E Explanation	AnswerEExp::
Right Answer	RightAnswer::C
Explanation	[[Explanation:: Educational Objective: References: ]]
Approved	Approved::Yes
Keyword
Linked Question	Linked::
Order in Linked Questions	LinkedOrder::