Influenza, an annual epidemic in the U.S., creates a significant increase in hospitalizations and an increase in the death rates of pneumonia and cardiovascular disease. Besides death, what is the most serious complication of influenza?
a) Tracheobronchitis
b) Viral pneumonia
c) Cardiovascular disease
d) Staphylococcal pneumonia
Answer: d) Staphylococcal pneumonia
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