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 2019-2020 Flu/RSV Season began on September 29, 2019 and will end on September 26, 2020.
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 in New Window.) Weekly reports start on Sunday and end the following Saturday.
This Week's Flu Report
All data are preliminary as of December 4, 2019, and may change as more reports are received.
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?
What does flu look like in Maricopa County hospitals?
The graph below shows the percent of Inpatient and Emergency Department visits that are related to influenza like illness from 34 hospitals across Maricopa County.