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9752 Microbiology

On November 6, a patient had the onset of an illness characterized by fever, chills, headache, cough, and chest pain. The illness lasted 1 week. On December 5, she had another illness very similar to the first, which lasted 6 days. She had no influenza immunization during this period. Her hemagglutination inhibition antibody titers to nH1N1 influenza virus were as follows:November 6: 10 November 30: 10 December 20: 160There was no laboratory error. Which of the following is the best conclusion from these data?

AThe patient was ill with influenza on November 6
BThe patient was ill with influenza on December 5
CThe patient was ill with influenza on December 20
DIt is impossible to relate either illness with the nH1N1 influenza virus
Microbiology
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