As we enter the peak of respiratory season and students and families return to their school and work routines after the holiday break, we want to share a timely health update to help Arizonans stay informed and prepared. 

Over the last few weeks there has been a sharp increase in the number of individuals testing positive for Flu and hospitalizations for flu. This comes at a time where we are also managing the largest measles outbreak in this state since the early 1990s. While measles and flu are different, both are respiratory diseases that are vaccine preventable and spread easily in group settings and among unprotected individuals. 

Our goal is to provide clear, practical information so individuals and families can take simple steps to stay well. 

Increased Influenza A Activity Across Arizona

Most cases this season are linked to a strain called Influenza A (H3N2), which has been circulating nationally since late summer. There is no evidence to suggest that Influenza A (H3N2) subclade K is associated with more severe illness. Symptoms of influenza infection include:

  • Fever
  • Headache
  • Muscle or body aches
  • Cough, congestion, or other respiratory symptoms

For most people, flu symptoms improve with rest and supportive care. However, influenza can be more serious for young children, older adults, pregnant individuals, and those with underlying health conditions. 

Measles Activity in Our Community

Measles is a highly contagious viral illness that spreads through tiny droplets in the air when an infected person coughs or sneezes. It can remain in the air for up to two hours after an infected person leaves the room, which allows it to spread quickly in group settings.

Symptoms of measles often include: 

  • Fever 
  • Cough
  • Runny nose
  • Red, watery eyes
  • A characteristic rash that typically starts in the face and appears several days after symptoms begin 

People with measles are contagious 4 days before and 4 days after the rash appears. Measles can lead to serious complications, particularly for infants, pregnant individuals, and people with weakened immune systems. 

The most effective way to prevent measles is by staying up to date with the MMR (measles, mumps, rubella) vaccination. Just one dose of measles vaccine is 93% effective against measles and two doses provides 97% protection. Vaccination not only protects individuals but also helps to reduce the spread within the community. 

Simple Steps That Make a Difference

There are practical, everyday actions that help reduce the spread of both measles and flu, especially as Arizonans return to school and work after the holidays: 

  • Stay informed. You can stay up to date on flu and measles activity by following our measles dashboard and respiratory illness dashboard.
  • Stay home when you’re sick. If you or your child have flu-like symptoms, staying home helps stop the spread and protects classmates, coworkers, and vulnerable community members.
  • Practice good hand hygiene. Wash your hands often with soap and water or use hand sanitizer when washing isn’t available. 
  • Cover coughs and sneezes. Use a tissue or your elbow and wash your hands afterward. 
  • Stay up to date on vaccinations. Vaccines remain one of the most effective tools for preventing severe illness and complications. 
  • Seek testing and medical care when needed. Early evaluation and treatment can help reduce complications, especially for those at higher risk. If you or your child develop measles symptoms, call ahead before visiting a clinic or emergency room to avoid exposing others.
  • Travel and Group Gatherings. Crowded indoor settings such as airports, planes, shopping centers, and large family gatherings increase the risk of spread of respiratory illnesses. Make sure vaccinations are current before traveling, and if traveling abroad, confirm immunity since measles remains common in many countries, including Mexico and Canada.

Staying Healthy Together

Flu and measles prevention works best when we look out for one another. Arizona is experiencing a measles outbreak and high flu activity statewide.  If you feel sick, staying home and limiting contact with others is one of the most effective ways to slow the spread and protect each other.

By staying vigilant, practicing good hygiene, and making thoughtful choices, like staying home when ill, we can reduce the impact of flu in our schools, workplaces, and communities. 

Learn More and Stay Informed

We will continue monitoring respiratory and vaccine-preventable disease activity and share updates as needed.

For flu information and resources, please visit azdhs.gov/flu

For measles  information, vaccination guidance and prevention tips and resources, please visit azdhs.gov/measles

Thank you for helping keep our community healthy this season.