Figure 1.

Variation in influenza-like illness (ILI) and respiratory viruses over time, shown as a percent of monthly positives divided by positives for the year, March 2013–January 2015. A peak in virus activity was defined as monthly proportion of virus greater than 10%.¹¹ (A) Variation in ILI and influenza (types A and B). (B) Variation in the three other most commonly isolated respiratory viruses: human enterovirus/rhinovirus (HEV/HRV), respiratory syncytial virus (RSV), and human metapneumovirus (hMPV).