Your guide to the 2026 flu, COVID-19 and RSV season

Flu vaccination rates remain alarmingly low

February 4, 2026 - As flu cases continue to rise, doctors are seeing a troubling increase in severe and sometimes life-threatening complications — particularly in children. 

While influenza is often dismissed as a routine seasonal illness, medical experts warn it can lead to infections that affect the lungs, brain, heart and other vital organs.

Mustafa Bakir, MD, a pediatric infectious disease specialist with OSF HealthCare, says the flu’s ability to damage the body’s natural defenses is what makes it especially dangerous.

Flu vaccination rates remain alarmingly low

January 20, 2026 - Since the end of the COVID-19 pandemic, the number of people becoming sick with influenza (flu) has drastically increased each respiratory illness season.

A major part of that, according to Mustafa Bakir, MD, pediatric infectious disease specialist with OSF HealthCare, is due to extremely low vaccination rates.

How vaccines strengthen natural immunity

January 20, 2026 - When a child suddenly refuses to walk days after recovering from the flu, it can be terrifying for parents, but doctors say a little-known condition called viral myositis is often the cause.

It’s a muscle condition most often seen in children during or shortly after common viral infections, especially influenza (the flu). While the condition can be alarming for parents, medical experts say it is usually temporary and treatable with proper care.

Mustafa Bakir, MD, a pediatric infectious disease specialist with OSF HealthCare, explains the condition, and what parents should do if this happens with their kids.

How vaccines strengthen natural immunity

January 12, 2026 - For many adults, especially those who grew up in an era when measles, chickenpox or the flu were simply “childhood illnesses,” it can feel natural to believe that getting sick is how the body builds strong immunity.

While infection does contribute to the immune “library,” modern vaccines offer a safer, more reliable way to add to that protection without the risks of serious illness, hospitalization or long-term complications.

As flu activity surges across the U.S. this winter, experts emphasize that vaccines remain one of the strongest tools for maintaining health and preserving natural immunity over a lifetime. Doug Kasper, MD, an infectious disease specialist with OSF HealthCare, shares why vaccines are such a powerful tool. 

Respiratory illness update | Friday, January 9

January 9, 2026 - Respiratory illness activity continues to be high across Illinois and Michigan. Hospitalizations for influenza, respiratory syncytial virus (RSV) and COVID-19 all increased ahead of the New Year. 

Data across the Ministry: 

More than 7,000 influenza tests were administered from 12/28 - 1/3 with a 23.3% positivity rate. 

Tests slightly decreased from the week before, along with the positivity rate - which was 30% the week prior.

Respiratory syncytial virus (RSV) continues to circulate throughout the region. Nearly 2,000 RSV swabs were administered between 12/28 - 1/3, with a 3.8% positivity rate. 

Roughly 5,000 COVID-19 tests have been administered in the above-mentioned time frame, with an 11.3% positivity rate for each of the last 2 weeks. 

In an effort to protect our patients, their family members and OSF Mission Partners - OSF will continue to offer complimentary masks to all guests and Mission Partners when entering any of our facilities. 

Visitor restrictions are in place, with a limit of two visitors 18 years of age or older, per patient at any time. Exceptions may be made for those under 18, as well as those in isolation for influenza-like illness, to promote the patient's emotional well-being. Exceptions may also be made for end-of-life or other extreme circumstances. 

As each situation may be unique and challenging, we graciously ask for patients to feel empowered and have a conversation with their OSF care team to discuss their situation.

Can't stop coughing?

January 6, 2026 - Can’t stop coughing? It’s a common question happening with all of the upper respiratory illness going around including colds, flu and RSV.

Maybe two weeks ago you had a virus, you treated the symptoms with antibiotics, you’re feeling much better, but the cough is just lingering. Juanbosco Ayala, MD, is a pulmonologist in the Intensive Care Unit (ICU) at OSF Little Company of Mary Medical Center in Evergreen Park, Illinois. He provides medical care to patients on a daily basis, especially people who have breathing disorders and lung disease, and explains potential reasons why coughs linger on the OSF Newsroom.

Staying healthy this holiday season

December 22, 2025 - Each winter, flu activity tends to rise just as families begin gathering for the holidays. This year is no exception. National surveillance data shows influenza circulating in many regions of the country, with ongoing activity expected through winter.

As travel, school breaks and holiday events increase, health experts emphasize planning ahead to stay well. Doug Kasper, MD, an infectious disease specialist with OSF HealthCare, shares tips for staying healthy this holiday season.

Scrub Smarter: Bathroom hygiene tips 

December 15, 2025 - Bathrooms are filled with germ-breeding objects, and your toilet isn’t the sole culprit. 

Showers, toothbrushes, soap dispensers and any surface can be added to the germy list, according to Kaylin Heinz, an infection preventionist RN with OSF HealthCare. Heinz offers some cleaning tips for the different areas of your bathroom that can be found on the OSF Newsroom.

Flu vaccine:

December 9, 2025 - Each flu season, families look for ways to protect themselves while juggling busy schedules – and for parents of children who fear needles, vaccinations can be especially challenging. This year brings a new, convenient option: a nasal spray flu vaccine that can be delivered directly to your home. Doug Kasper, MD, an infectious disease specialist with OSF HealthCare, speaks to the improvement in access, and decrease in anxiety for kids this provides. 

Outdoor safety:

December 2, 2025 - A good way to prevent winter illnesses is by staying safe outdoors. Maddy Draper, APRN, a provider at OSF OnCall, has tips about bundling up and more.

Hand hygiene:

November 25, 2025 - Emily Isom has a resolution for kids and their parents with holiday gatherings upon us: pledge to keep your hands clean and away from your face to prevent the spread of illness.

Isom, a certified medical assistant in pediatrics at OSF HealthCare, often sees young people biting dirty fingernails and not washing their hands properly. She has a primer here.

Hand, foot and mouth disease (HFMD):

November 7, 2025 - One viral infection to pay close attention to this season is hand, foot and mouth disease (HFMD).

HFMD typically impacts young children, but adults and older children can get it, too. It causes painful red blisters in the mouth and throat, and on the hands, feet, and diaper area. HFMD is most common in children who are in child care because young children need frequent diaper changes and help using the bathroom. They also tend to put their hands in their mouths.

Find more information about symptoms and treatment options here. 

RSV hospitalizations 2024: 

November 6, 2025 - There was a steep decline in respiratory syncytial virus (RSV) hospitalizations among infants last RSV season, offering welcome relief this time around. Health officials point to the new vaccines and preventive antibodies as the driving force behind the turnaround.

Read about the stark drop in RSV hospitalizations in the full article here. 

COPD 2025:

November 4, 2025 - It’s something Michael Daley, MD, sees in the emergency department often and especially this time of year: chronic obstructive pulmonary disease, or COPD.

Dr. Daley, who provides care at OSF HealthCare, says while there’s no cure for COPD, medicine has come a long way to improve your quality of life with the disease.

Read the full story here.

Pneumonia 2025:

November 3, 2025 - Pneumonia.

It’s a hard enough word to spell, let alone remember how to prevent and treat it. With respiratory illness season here, it’s time for a reminder about how to avoid this possibly deadly condition.

Read the full story with OSF emergency department physician Fred Burke here.

Viral sore throat vs. bacterial sore throat: 

October 22, 2025 - With temperatures cooling, Awad Alyami, MD, an OSF HealthCare pediatrician, says we’re approaching the peak season for sore throats. Many cases have time-tested treatments, but some can have serious complications.

Dr. Alyami says a sore throat is an infection that causes inflammation in your throat. They’re annoying and painful, bringing symptoms like difficulty swallowing or talking and swelling of glands and tonsils. Causes can include tonsil stones, heartburn and allergies. But most commonly, causes break down into two groups: viral and bacterial.

Viral sore throat symptoms:

• Often comes with coughing or a runny nose
• May occur with cold, flu, or COVID-like symptoms
• Usually mild and can be treated at home with rest, hydration, and over-the-counter medicine

Bacterial (strep throat) symptoms:

• Sore throat with fever
• White patches on the back of the throat or tonsils
• May cause neck swelling in more serious cases
• More common in children
• Needs medical treatment to prevent complications like dehydration

Read the full story here. 

Respiratory distress in sick children:

October 7, 2025 – Respiratory distress can develop quickly in children, often from viral infections like RSV or influenza. Knowing when to seek care is vital, says Dr. Kelsey Grimes, a pediatrician with OSF HealthCare. “During work-time hours, you can call your pediatrician’s office and try to get a same-day appointment,” she says, noting that emergency care or 9-1-1 may be needed in severe cases. From using nasal saline and humidifiers at home to recognizing emergency signs, proactive steps help parents protect their children’s health. Read the full story here. 

Full guide to the 2025 flu, COVID-19 and RSV season (original article): 

September 15, 2025 – Across the board, late 2024 to early 2025 was recognized as a “rough” respiratory illness season.

“It was the season we had been predicting for five years, and we had a conjoining of three diseases," says Brian Curtis, MD, vice president chief medical officer for OSF Medical Group, part of OSF HealthCare, headquartered in Peoria, Illinois.

RSV (respiratory syncytial virus), influenza and COVID-19 were all heavily circulating communities in the winter months, all at the same time.

This puts a tremendous strain on the entire medical system for so many people to all get sick at once, Dr. Curtis adds. From a clinic setting, to an emergency department (ED) setting and everything in between, an influx of patients at the same time can impact how quickly people can be seen for other health concerns. 

Dr. Curtis says the 2024 respiratory illness season had reverted to a traditional pattern of RSV and Influenza circulating in the fall and winter months which is a "normal" respiratory illness season. Influenza started circulating in October and November and peaked in January and February (2025). RSV "reared its head" in the late winter, Dr. Curtis adds, which is generally expected. Along with COVID circulating through the same period. The confluence of these three viruses made a difficult busy respiratory season.

How does this impact the 2025-2026 season? 

"You don't know," Dr. Curtis points out.

There are a few key factors to pay attention to which will help paint the picture over time.

-          How effective the influenza vaccine is

-          How many people receive the flu vaccine

"Flu vaccines are ready. So, if you're ready, we're ready. People can start getting it now, and I'd recommend getting it by the end of October," Dr. Curtis says.

You can schedule an office visit through OSF MyChart to receive a vaccine at any OSF Medical Group – Primary Care location, or by visiting an OSF OnCall Urgent Care or OSF PromptCare walk-in clinic. You can also be seen at these locations for several health concerns like viral illnesses. OSF OnCall Urgent Care also offers the option to make a reservation ahead of time but also accepts walk-in patients.

-          How many high-risk individuals receive the RSV vaccine

There are two one-time RSV vaccines. The adult vaccine, which is a vaccine in the traditional sense, for people who are high-risk. This is supposed to help train your immune system to recognize and fight off certain viruses or bacteria, without getting severely ill.

Those who can receive the shot include pregnant women (who are 32 to 36 weeks pregnant who will deliver during the RSV season), all people 65 and older, and those 50 and older who have serious health conditions such as chronic heart disease, chronic lung disease, severe diabetes and a weakened immune system. 

The second vaccine is for very young kids, and it's a monoclonal antibody, which is a lab-made protein that works like natural antibodies and helps your body fight infections. It's called Beyfortus® (nirsevimab-alip). It's an injection for babies under 8 months of age entering their first RSV season.

If your child has serious health challenges like being on oxygen, having heart issues or lung issues, you might want to consider having your child receive nirsevimab into their second RSV season as well. But Dr. Curtis says to speak with your health care provider, as each situation can be unique. 

-          How members of the public respond when they are sick

Besides receiving your vaccines, hand washing, staying home when sick and covering your cough are three tips Dr. Curtis gives to not spread your germs to others. Last year, Dr. Curtis adds, people were returning to pre-pandemic behaviors such as returning to work in person while sick, which causes viruses to spread more rapidly. 

Flu vaccine myth

Dr. Curtis advises it’s never too late to receive your flu vaccine.

“If it's December or January and you haven't gotten it, you can still get it. It's still worthwhile and beneficial for you to do that. So don't think 'it's halfway through the season why bother now?' Flu doesn't care where it's in the season and it doesn't care who you are."

It's a myth to think that if you get your flu vaccine early, it won't protect you for the whole season. Dr. Curtis says that's just not true. 

What mild symptoms look like (and what to do)

Most mild cases of respiratory illnesses like RSV, COVID-19, influenza and rhinovirus or enterovirus (common cold) can be taken care of in the comfort of your own home.

"That could be a low-grade fever, cough, congestion and body aches." Dr. Curtis advises, "Tylenol and Motrin can be used, if your health circumstances allow for it, and then drinking fluids and having plenty of rest is the care for that."

Seeking medical care from a health care professional, in any type of setting, is not needed for people with mild symptoms. 

However, there are times when serious medical attention is required.

When it’s time to be seen by a medical provider

• Trouble breathing
• Unable to keep liquids down
• Fever not responding to Tylenol or Motrin
• People not acting like themselves mentally
• Serious illness lasting more than 7 days with no signs of improvement

What steps can you take now?

"The best thing you can do is take care of yourself and make sure your body is the healthiest it can be. That means prioritizing exercise, sleeping, eating right and limiting your intake of alcohol. Not taking care of your body can wear down your system and leave you susceptible to getting infections,” Dr. Curtis says.

OSF OnCall offers virtual options for patients to get care 24/7 through its Virtual Urgent Care. The appointment generally takes 5-10 minutes and gets sick patients a treatment plan within 30 minutes. No appointment is needed.

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