WBR0854

Author	[[PageAuthor::Mohamed Moubarak, M.D. [1]]]
Exam Type	USMLE Step 3
Main Category	Primary Care Office
Sub Category	Infectious Disease, Infectious Disease
Prompt	A 26 year- old male comes to your office in January complaining of dry cough, headache, sore throat, and feeling of tiredness started yesterday. He mentions a pain all over his body. On examination, the patient is feverish with temperature 39 C (102 F), heart rate 100/min, blood pressure 140/80 mmHg, and respiratory rate of 22/min. Which of the following will confirm your diagnosis?
Answer A	Blood culture
Answer A Explanation	Incorrect Influenza virus best diagnosed with viral antigen detection using nasopharyngeal swab
Answer B	Sputum culture
Answer B Explanation	Incorrect The patient has a dry cough, beside the influenza virus best diagnosed with viral antigen detection using nasopharyngeal swab
Answer C	Nasopharyngeal Swab
Answer C Explanation	Correct Influenza virus best diagnosed with viral antigen detection using nasopharyngeal swab
Answer D	Urine culture
Answer D Explanation	Incorrect Urine culture is not useful confirming the influenza diagnosis
Answer E	Family history
Answer E Explanation	Incorrect People with flu can spread it to others up to about 6 feet away. Most experts think that flu viruses are spread mainly by droplets made when people with flu cough, sneeze or talk, so it can be obtained from any one not only from the family members.
Right Answer	C
Explanation	It is very difficult to distinguish the flu from other viral or bacterial causes of respiratory illnesses on the basis of symptoms alone. Influenza viral infection usually present with fever, headache, cough, sore throat, arthralgia, and myalgia. The best diagnostic test for influenza is viral antigen detection testing of the nasopharyngeal swab. Educational Objective: The best diagnostic test for influenza is viral antigen detection testing of the nasopharyngeal swab. References: None.
Approved	No
Keyword	Influenza
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