FIGURE 2—

Monthly percentage of health care seeking among children and health care seeking, influenza diagnosis, and antiviral treatment among adults, by onset period: Behavioral Risk Factor Surveillance System, United States, September 1, 2009–March 31, 2010.

Note. ILI = influenza-like illness.

^aAmong children with ILI.

^bAmong adults with ILI.

^cAmong adults with ILI who sought care and recalled an influenza diagnosis.

^dAmong adults with ILI who sought care.