As of late June 2026, the respiratory illness landscape in the US looks different from what it did in winter. Some illnesses have receded for the season. Others remain elevated. A few are climbing in specific regions or specific age groups. Here’s the current snapshot, why each one matters, and when symptoms suggest you need to seek care.
What’s Currently Elevated
The CDC’s June 2026 respiratory data shows three viruses running above seasonal expectations.
Parainfluenza virus (PIV) is elevated nationally. PIV causes a range of respiratory illnesses, but it’s best known as the cause of croup in young children. Symptoms include cough (often a “barking” cough in kids), fever, runny nose, and sometimes wheezing. Most cases resolve at home, but croup that causes stridor (a high-pitched whistling sound when breathing in) or any breathing difficulty needs medical attention promptly.
Human metapneumovirus (HMPV) is also elevated nationally, though now beginning to decline. HMPV causes cold-like symptoms in healthy adults but can cause more severe lower respiratory infection in young children, older adults, and people who are immunocompromised. Symptoms are nearly identical to a bad cold or a mild flu: cough, fever, congestion, sometimes shortness of breath.
Rhinovirus and enterovirus (RV/EV) activity is elevated as well, but on a downward trend. Rhinovirus is the most common cause of the common cold and a frequent trigger for asthma attacks. In summer, enteroviruses can also cause hand-foot-and-mouth disease in children.
What’s Currently Low (For Now)
COVID-19 activity is low nationally as of late June. The CDC has flagged the South and West as regions at heightened risk of summer increases, with new variants including BA.3.2 (“Cicada”) and current dominant strains NB.1.8.1 and XFG circulating. See our piece on the 2026 summer COVID watch for the fuller picture.
Influenza activity is low, with the flu season effectively over until fall.
RSV activity is also low for the season. RSV surveillance picked back up after a long, severe winter season that included 190,000 to 350,000 hospitalizations and 10,000 to 23,000 deaths from July 2024 to June 2025.
What’s Still Around Year-Round
Pertussis (whooping cough) continues to circulate. Cases are lower than their November 2024 peak but remain higher than pre-pandemic levels. Whooping cough is highly contagious. The signature symptom is severe, paroxysmal coughing fits often followed by a “whoop” sound on inhalation, sometimes with vomiting at the end of a fit. Babies under one year are at highest risk of severe complications. Treatment with antibiotics, started early, can shorten the illness and reduce transmission to others.
Mycoplasma pneumoniae, the bacterium that causes “walking pneumonia,” remains elevated in some parts of the country. Walking pneumonia is a milder form of bacterial pneumonia named for the fact that people often feel sick enough to be miserable but well enough to keep going about their day. Symptoms include a persistent dry cough that often gets worse at night, low-grade fever, fatigue, sore throat, and chest discomfort.
Measles, while not typically grouped with seasonal respiratory illness reports, is having one of its worst years since the 1990s. As of mid-June 2026, the US has confirmed over 2,100 cases across 41 states. See our [piece on the 2026 measles surge](INTERNAL-LINK: /blog/measles-rising-us-2026) for the deeper context.
What Symptoms Should Prompt Care
Most respiratory illnesses share a similar early presentation. Cough, fever, runny nose, fatigue, body aches in some combination. That overlap is the reason testing matters when treatment depends on the specific cause (flu antivirals, COVID antivirals, antibiotics for pertussis or pneumonia).
A few patterns deserve prompt evaluation. Persistent shortness of breath or shortness of breath at rest is the most important. So is a cough that produces blood, chest pain when breathing or coughing, a fever above 103°F that won’t break, or a cough that’s lasted more than 3 weeks. Symptoms that improved and then turned worse (the “double sickening” pattern that often signals a bacterial infection on top of a viral one) deserve attention too. Confusion or significant lethargy in someone who shouldn’t have it is always a reason to skip the chat window and see someone in person.
Babies under 3 months with any fever, and older infants with feeding difficulty, lethargy, or rapid breathing, need to be seen the same day.
Where ChatRx Fits
Most of the respiratory illnesses circulating in 2026 fit well within virtual urgent care for otherwise healthy adults. ChatRx treats COVID-19, influenza, acute bronchitis, upper respiratory infections, sinusitis, pharyngitis, and strep throat as part of our 39 acute conditions. If you’re in Indiana, Illinois, or Michigan, a physician reviews your case and can prescribe antivirals, antibiotics, or supportive treatment when appropriate. Chat-based, $25 flat.
For suspected complicated pneumonia, pertussis in vulnerable patients, measles, or any suspected serious complication, our doctors will redirect you to in-person care, since these situations require labs, imaging, or longer treatment courses than virtual visits can provide.
The free symptom checker can help you sort which version of the current viruses you might be dealing with. No account required.
Quick Take
Late June 2026 looks different from winter. Flu and RSV are out of season. COVID is low but the South and West are on watch for summer activity. Parainfluenza, HMPV, and rhinoviruses are elevated. Whooping cough and walking pneumonia continue to circulate. And measles is in the middle of its worst year in decades. Most of these are treatable, and most healthy adults handle them at home or through a virtual visit. The ones that need in-person care are the ones with breathing issues, persistent high fever, or any sign of pneumonia.
When symptoms hit, knowing what’s circulating helps you make smarter decisions about testing, treatment, and when to call for help.
Frequently Asked Questions
For most healthy adults, the viruses on this list (HMPV, parainfluenza, rhinovirus) run their course like a bad cold and clear up with rest, fluids, and time. The bigger concern is usually what you might pass along, since these same viruses can hit infants, older adults, and people who are immunocompromised much harder. Symptom severity is still worth paying attention to for yourself too. The warning signs in this piece, like breathing trouble or a fever that won’t come down, apply no matter your risk category.
The whoop isn’t always present, especially in adults, teenagers, or anyone who’s been vaccinated, so its absence doesn’t rule pertussis out. A cough that comes in fits, especially if it ends in gagging or vomiting, or one that’s lasted several weeks without letting up, is worth mentioning to a doctor even without the classic sound. Early treatment matters most for limiting how contagious you are to others.
Disclaimer
This information is provided for educational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment through ChatRx. If you have questions about a medical condition, talk with a qualified healthcare provider. Services like ChatRx can help connect you with licensed physicians.
