Yes, RSV is contagious in adults. You can spread the virus for 3 to 8 days after becoming infected, and you may actually be contagious a day or two before you notice any symptoms. This means you could be passing RSV to others without realizing you’re sick.
How Long You’re Contagious
The contagious window for RSV typically runs 3 to 8 days. It starts a day or two before symptoms appear, which is part of what makes the virus so easy to spread. After exposure, symptoms usually show up within 4 to 6 days, so there’s a brief overlap where you feel fine but are already shedding the virus.
Once your symptoms begin improving and you’ve been fever-free for at least 24 hours (without fever-reducing medication), you’re generally less contagious. But “less” doesn’t mean “not at all.” Your body can still shed the virus after you feel better, so the CDC recommends taking extra precautions for five more days after that point: wearing a well-fitted mask around others, improving air circulation, and keeping your distance when possible. After those five days, your risk of spreading the virus drops significantly.
People with weakened immune systems are an exception. They can shed RSV for much longer than the typical window, making them a potential source of transmission well after symptoms resolve.
How RSV Spreads Between People
RSV spreads the same way most respiratory viruses do. When an infected person coughs, sneezes, or talks, tiny droplets carrying the virus can land on nearby surfaces or be inhaled directly by someone close by. You can also pick up the virus by touching a contaminated surface and then touching your face, particularly your eyes, nose, or mouth.
Because adults with RSV often look and feel like they just have a mild cold, they tend to go about their normal routines, heading to work, visiting family, running errands. That’s a big part of why RSV circulates so easily. Adults who wouldn’t think twice about a runny nose can unknowingly pass the virus to someone far more vulnerable, like an older relative or a grandchild.
What RSV Feels Like in Adults
Most healthy adults experience RSV as a standard cold: runny nose, congestion, mild cough, maybe a low-grade fever or sore throat. It’s mild enough that many people never get tested and never know they had RSV rather than a regular cold. Symptoms typically resolve on their own within a week or two.
For some adults, though, RSV can move deeper into the lungs and cause pneumonia. This is more likely if you have an underlying health condition. RSV can also trigger flare-ups of asthma, worsen COPD, or strain an already weakened heart in people with heart failure. These complications are what make RSV a serious concern for certain groups, even though the virus seems harmless to most healthy adults.
Who Faces Higher Risk
The list of conditions that raise the stakes with RSV is longer than most people expect. It includes chronic lung diseases like COPD and asthma, heart failure and coronary artery disease, chronic liver disease such as cirrhosis, sickle cell disease, severe obesity (a BMI of 40 or higher), diabetes with organ damage, kidney disease requiring dialysis, and moderate to severe immune compromise. Neurological conditions that weaken the muscles used for breathing or make it harder to clear the airway also increase risk. Living in a nursing home is an independent risk factor as well, partly because close quarters make transmission easy and partly because residents tend to have multiple underlying conditions.
When to Go Back to Normal Activities
The CDC’s guidance for returning to work, school, or social life with any respiratory virus, RSV included, comes down to two checkboxes: your symptoms are clearly improving overall, and you’ve gone at least 24 hours without a fever and without taking anything to reduce one. Once both are true, you can resume your routine, but you should still take precautions for the next five days. That means masking in crowded or indoor settings, staying physically distant when practical, and prioritizing good hand hygiene.
If you’re around infants, older adults, or anyone with compromised immunity, those five days of extra caution matter a lot. You may feel fine, but you can still carry enough virus to cause a serious infection in someone more vulnerable.
Testing and Diagnosis
Because RSV symptoms overlap so heavily with the common cold and flu, the only way to confirm it is through a lab test. PCR-based tests are the most sensitive option and work well in adults. Rapid antigen tests are also available and return results faster, though they’re somewhat less accurate. Your doctor may order testing if your symptoms are unusually severe, if you have a condition that puts you at higher risk, or if knowing the specific virus would change your care plan. For most otherwise healthy adults with mild cold symptoms, testing isn’t routinely necessary.
RSV Vaccines for Adults
Three RSV vaccines are now available for adults: Arexvy (GSK), mResvia (Moderna), and Abrysvo (Pfizer). The CDC recommends a single dose for all adults 75 and older. Adults between 50 and 74 are also recommended to get vaccinated if they have any of the conditions that raise the risk of severe illness, including chronic heart or lung disease, diabetes with complications, severe obesity, immune compromise, or residence in a nursing home. Two of these vaccines, Abrysvo and mResvia, are also approved for adults ages 18 to 49 who are at increased risk, though broader recommendations for that younger group are still under review.
If you fall into one of these higher-risk categories and haven’t been vaccinated, it’s worth discussing with your healthcare provider, especially heading into fall and winter when RSV circulates most actively.