Fall and Winter Virus Season

It is common to get sick from respiratory viruses such as flu, COVID-19, and respiratory syncytial virus (RSV), especially in the fall and winter. Learn more about each of the viruses, how to protect yourself, what to do if you're sick, and how the viruses are spreading in Maricopa County.

Prevent Sickness Find Vaccine If You're Sick Local Activity

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Flu is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and sometimes the lungs.

Everyone 6 months and older should receive a seasonal flu vaccine.

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COVID-19 can be very contagious and spreads quickly. Most people with COVID-19 have mild symptoms, but some people become severely ill.

Everyone 6 months and older should receive an updated COVID-19 vaccine.

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RSV usually causes mild, cold-like symptoms. Most people recover in a week or two, but RSV can be serious, especially for babies and older adults.

Talk to your healthcare provider about RSV vaccination if you're:

Prevent Getting Sick


Get Vaccinated

Get a yearly flu vaccine and an updated COVID-19 vaccine. Certain groups should also get vaccinated against RSV after speaking with their healthcare provider.

Find a Vaccine near you at our clinics, community events, or on vaccines.gov. You can also call the MCDPH CARES Team at 602-506-6767 for assistance.


Everyday Actions to Prevent Infection

  • Avoid contact with people who are sick.
  • Wash your hands often with soap and water. If soap and water are not available, use an alcohol-based hand rub.
  • Avoid touching your eyes, nose, and mouth.
  • Clean and disinfect surfaces and objects that may be contaminated with viruses that cause flu.
  • Consider wearing a mask if you are at high risk and respiratory viruses are widespread in your community. 

Find a Vaccine

What to do if you're sick

The signs and symptoms of flu, COVID-19, and RSV are similar and can make it difficult to tell which you have. 

Knowing if you're positive with COVID-19 will help you determine how long you should avoid being around others and what precautions to take. Visit our COVID-19 Testing page for options. Knowing what infection is making you sick lets you know if there are specific treatments available.

Prescription antiviral treatments for COVID-19 and for flu are widely available and can lower your risk of severe illness, hospitalization, and death if they are started soon after you become infected. 

Treatment for RSV is supportive care, as there is no effective antiviral for RSV at this time.

Virus Activity in Maricopa County

We track and issue reports on confirmed cases of COVID-19, influenza, and RSV in Maricopa County.

COVID-19 Data

Flu Reports

RSV Reports