2018-2019 Influenza Season Week 47 ending November 24, 2018
All data are preliminary and may change as more reports are received.
Influenza activity in the United States increased slightly. The increase in the percentage of patient visits for ILI may be influenced in part by a reduction in routine healthcare visits during the Thanksgiving holidays, as has occurred in previous seasons. Influenza A(H1N1) pdm09, influenza A(H3N2), and influenza B viruses continue to co-circulate, with influenza A(H1N1) pdm09 viruses reported most commonly by public health laboratories since September 30, 2018. Below is a summary of the key influenza indicators for the week ending November 24, 2018:
An overview of the CDC influenza surveillance system, including methodology and detailed descriptions of each data component, is available at http://www.cdc.gov/flu/weekly/overview.htm.,