The Centers for Disease Control and Prevention provides a flu map of the United States on its website. The CDC flu map tracks weekly influenza activity in the country as reported by state and territorial epidemiologists.
The CDC provides influenza surveillance during the flu season, which runs from October to May. In the CDC flu map, states are categorized into the activity levels ranging from No Report and No Activity to Sporadic, Local, Regional and Widespread. The map measures the spread of the flu activity, not its severity. The website also provides detailed weekly reports on influenza activity, a brief overview of weekly activity and dynamic visualizations of influenza data collected by the CDC.