A 32-year-old woman presents to the outpatient department during the winter season with fever, cough, and myalgia for 3 days. Rapid antigen detection confirms influenza A infection. Which of the following is the most common subtype of influenza A virus responsible for seasonal epidemics in humans?

See the options, answer & explanation

Sign in free to reveal the answer choices, the correct answer, the detailed explanation, and AI-powered insights for this question.