In July 9,2009 about 2% of patients visiting emergency rooms had influenza.This number rose until in October of that year,when 10% had influenza.This was probably a(n)

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The increase in the percentage of patients with influenza from 2% to 10% in a short period of time suggests a sudden outbreak affecting a larger population, which is consistent with the definition of an epidemic. A superinfection occurs when a patient with an existing infection acquires a new infection, a sporadic outbreak refers to isolated cases with no clear pattern, an index case is the first reported case in an outbreak, and an opportunistic outbreak is typically associated with immunocompromised patients.

In July 9,2009 About 2% of Patients Visiting Emergency Rooms