Public Health tracks cases of influenza (flu) and respiratory syncytial virus (RSV). The team that tracks these cases creates weekly reports during the influenza/RSV season. At the end of the year, a yearly report summarizes the data.
The first day of the 2018-2019 season was September 30, 2018. Flu/RSV season will continue through September 28, 2019.
Public Health tracks flu and RSV cases by MMWR weeks, which is a standard way across the United States of numbering weeks in a year to track disease. (Learn more about MMWR weeks Opens a New Window. .) Weekly reports start on Sunday and end the following Saturday.
This Week's Flu Report
Data below are as of March 20, 2019.
All data are preliminary and may change as more reports are received.
How widespread is the flu in Arizona right now?
How do this season's current numbers compare to previous years' data?
How does flu in Maricopa County this year compare to flu in previous years?