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Q&AZ: How does Arizona's extreme heat make its flu season longer?

An antiviral medication used to treat influenza
Sky Schaudt/KJZZ
An antiviral medication used to treat influenza.

While flu season typically peaks in the winter, it can linger for Arizonans later in the year.

Arizona’s flu season starts later in the winter and can linger into June or July because of the state’s climate. There have been over 600 COVID-19 cases and 30 flu cases reported in Arizona this week alone, according to Maricopa County.

Doug Doehrman, an emergency room doctor at HonorHealth, says people gathering inside for AC can help spread viruses.

“These viruses flourish in the winter is a lot of people are spending a lot of time together indoors in this heated environment,” Doehrman said. “That’s just the perfect environment for these respiratory viruses to spread, but in Arizona we spend a lot of time in summer indoors.”

He recommends getting the flu shot for next season when it comes out later this year as early as possible.

“Definitely in Arizona you know staying well hydrated, getting a lot of rest can definitely help your immune system stay strong,” Doerhman said.

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Ginia McFarland was an intern at KJZZ in 2025.