People with RSV are typically contagious for 3 to 8 days. That window can start a day or two before symptoms appear, meaning you can spread the virus before you even know you’re sick. For most healthy older children and adults, infectiousness drops off as symptoms improve. But for infants and people with weakened immune systems, the timeline can stretch significantly longer.
The Standard Contagious Window
For the average person, RSV’s contagious period runs 3 to 8 days. It begins roughly 1 to 2 days before symptoms show up and continues through the first several days of illness. Viral shedding tends to peak around day 6 after initial infection, which often lines up with the worst of the symptoms: heavy congestion, coughing, and fatigue. After that peak, the amount of virus you’re releasing drops steadily.
The tricky part is that presymptomatic window. Because you can spread RSV before you feel anything, it’s common to unknowingly pass it to family members, especially young children, during the first couple of days when you might just feel a little off or have no symptoms at all.
When Infants and Immunocompromised People Stay Contagious Longer
Some infants and people with weakened immune systems can continue shedding RSV for 4 weeks or longer, even after their symptoms have cleared. Their bodies take much longer to fully suppress the virus, so they remain a source of infection well past the point where they look and feel better.
In extreme cases, shedding can last far longer than a month. One documented case involved a 15-month-old undergoing chemotherapy for cancer who shed RSV continuously for seven months. That’s an outlier, but it illustrates why hospitals take extended precautions with immunocompromised patients. If your child has a condition that affects their immune system or is receiving treatments like chemotherapy, RSV can linger in their body for weeks to months even when they seem recovered.
Still Contagious After the Fever Breaks?
Yes. Feeling better does not mean you’ve stopped spreading the virus. RSV shedding can continue after fever subsides and acute symptoms wind down. This is especially true for young children, who tend to shed the virus for longer than adults even when they’re otherwise healthy. The CDC notes that some infants keep spreading RSV after they stop showing symptoms entirely.
There’s no simple home test to confirm you’ve stopped being infectious. For practical purposes, most people are no longer contagious once their symptoms have clearly improved and at least 8 days have passed since symptoms started. For infants or anyone with immune issues, a more cautious timeline is appropriate.
How RSV Spreads Between People
RSV transmits through respiratory droplets when an infected person coughs or sneezes, but it also spreads through contaminated surfaces, which makes it unusually persistent in households and daycare settings. The virus survives on hard surfaces like countertops for up to 6 hours. On rubber gloves it lasts about 90 minutes. On fabric and paper tissues, it stays viable for 30 to 45 minutes. On skin, about 20 minutes.
This means touching a counter or toy that an infected child recently coughed on, then touching your face, is a realistic way to pick up the virus. Regular handwashing and wiping down frequently touched surfaces during an active RSV illness in your household makes a measurable difference, especially during those first several days when viral load is highest.
Returning to School or Work
There are no universal “return to school” rules for RSV the way there are for conditions like strep throat. Most schools and daycares follow the general principle that a child should be fever-free and have improving symptoms before returning. Given that the typical contagious period is 3 to 8 days, keeping a child home for at least several days after symptom onset, and until they’re clearly on the mend, is a reasonable approach.
For adults, the same general timeline applies. You’re most contagious in the first few days of symptoms, and your risk of spreading the virus drops substantially after about a week. If you work around infants, elderly adults, or immunocompromised individuals, erring on the longer side of that 8-day window is worth considering, since these groups face the highest risk of severe RSV illness.
Quick Reference by Group
- Healthy adults: contagious for roughly 3 to 8 days, starting 1 to 2 days before symptoms appear
- Healthy children: same general window, though young children often shed virus slightly longer than adults
- Infants: can remain contagious for 4 weeks or more, even after symptoms resolve
- Immunocompromised individuals: 4 weeks or longer, with rare cases extending to several months