Influenza (Flu) Test

Influenza (flu) is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and lungs. Some people, such as people 65 years and older, young children, and people with certain health conditions, are at higher risk of serious flu complications. There are two main types of influenza (flu) viruses: types A and B. The influenza A and B viruses that routinely spread in people (human influenza viruses) are responsible for seasonal flu epidemics each year.

  1. Data and Reports
  2. Signs & Symptoms 
  3. Diagnosis
  4. Treatment
  5. Prevention

What Public Health Tracks

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 2023-2024 Flu/RSV season began on October 1, 2023, and continues through September 28, 2024.

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). Weekly reports start on Sunday and end the following Saturday.

This Week’s Flu Report

All data are preliminary as of January 31, 2024, and may change as more reports are received.

How widespread is the flu in Arizona right now?

widespread dashboard indicator

See definitions >