Repeated USMLE Questions Step 2 CK- Review- 27

Q- Which one of the following tests is the most accurate for an infectious disease?

A- Antibiotic sensitivity test

B- Culture

C- Serum IgM level

D- Serum IgG level

B- Culture- It is the most confirmatory test for the organisms that grow in culture including staphylococci and streptococci. 

Q- Which one of the following conditions needs prophylactic antibiotics before dental procedures?

A- History of arrhythmia

B- History of congestive heart failure

C- History of infective endocarditis

D- History of myocardial infarction

C- History of infective endocarditis- It is the only condition on the list that needs prophylactic antibiotics before any dental procedure. Other conditions that need prophylaxis are prosthetic valve and cyanotic congenital heart diseases.

Q- A patient presents with acute sinusitis for 3 days. Which of the following is the appropriate treatment of this patient?

A- Amoxicillin

B- Doxycycline

C- Cephalexin

D- Symptomatic treatment

D- Symptomatic treatment- Most cases of acute sinusitis are due to viral infection. Antibiotics are only used if symptoms persist or worsen for more than 7 days.

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