RSV at daycare — what parents should know.

Respiratory syncytial virus — RSV — is the leading cause of infant hospitalization in the United States. By age two, nearly every child has had it. The first infection is the one that lands in the emergency department most often. Daycare is, statistically, one of the primary places infants encounter it for the first time.

In 2023 the CDC and AAP added two new tools to the prevention toolkit — a maternal vaccine during pregnancy and a long-acting monoclonal antibody for infants, nirsevimab. Those have meaningfully changed what an RSV season looks like for daycare-age children. This guide explains what RSV is, how it spreads in daycare classrooms, what 2026 protections exist, how the AAP recommends thinking about exclusion, and the questions to ask your director before the November-to-March season starts.

What RSV is

RSV is a common respiratory virus that infects the upper and lower airways. In healthy adults and older children it causes a cold. In infants and very young toddlers — especially in the first six months of life — it can cause bronchiolitis (inflammation of the smallest airways) and pneumonia. The CDC estimates RSV is responsible for 58,000 to 80,000 infant hospitalizations and 100 to 300 deaths in children under 5 in the US in a typical year.

Two facts about RSV matter most for daycare:

• It is extremely contagious. RSV spreads through respiratory droplets, contact with contaminated surfaces (toys, doorknobs, crib rails — RSV survives several hours on hard surfaces), and direct contact with infected secretions.
• The first infection is almost always the most severe. Repeat RSV infections through childhood are typically mild. So the goal of prevention in the first year of life is to delay or soften the first encounter.

Why daycare drives spread

A typical infant room in a US licensed daycare has eight infants and two teachers (the 1:4 ratio set by most states; see our state ratios guide). Eight infants in one room with shared toys, shared bottle stations, and adults moving between cribs is a near-ideal RSV transmission environment. CDC modeling and the Caring for Our Children health and safety standard both treat respiratory virus spread in child care as essentially inevitable during the season.

RSV season in most of the US runs roughly November to March, peaking in December and January. Southern states (Florida especially) see earlier seasons starting in September; northern states see later peaks. CDC surveillance maps update weekly during the season.

What is new in 2026 — nirsevimab and the maternal vaccine

The 2023-2024 season was the first to include both new prevention tools widely. The 2024-2025 season had broader uptake. The 2025-2026 season is the first where most US infants who want it can get it.

Nirsevimab (brand name Beyfortus) is a long-acting monoclonal antibody. One injection in the first week of life — or before the infant's first RSV season — provides passive immunity that lasts at least five months. Real-world effectiveness data from the 2023-2024 season showed about 80 to 90 percent reduction in RSV hospitalizations among infants who received it. CDC ACIP recommends nirsevimab for all infants under 8 months entering their first RSV season, and for some children 8 to 19 months with risk factors.

The maternal RSV vaccine (RSVpreF, brand name Abrysvo) is given to pregnant individuals between 32 and 36 weeks of pregnancy and transfers protective antibodies to the baby. Effectiveness against severe RSV in the infant's first 90 days is similar to nirsevimab. The two approaches are alternatives, not stackable — most families pick one.

For families starting daycare in the November-to-March window with an infant born between roughly April and November, this is the single most important conversation to have with the pediatrician.

What a good daycare RSV protocol looks like

RSV is not a reportable disease in most states (it does not trigger the same public health response as measles or pertussis), but high-quality daycares treat respiratory virus prevention as core operational practice. A reasonable infant room protocol includes:

• Strict handwashing — staff wash hands between diaper changes, between bottle handling, and between holding different infants. CDC and AAP both classify handwashing as the single most effective measure.
• Toy rotation and sanitization. In infant rooms specifically, anything mouthed gets pulled and sanitized; remaining toys are sanitized at minimum at the end of each day.
• Hard-surface disinfection — crib rails, changing tables, doorknobs — at least daily, more during respiratory season.
• Staff exclusion — teachers with cold symptoms stay home. This is one of the most predictive operational signals. Centers that pressure staff to come in sick will have worse RSV transmission than centers that pay sick time and cover with floating teachers.
• Bottle hygiene — each infant's bottles go in their own labeled bag and are not handled by a teacher between two different infants without handwashing.

A center that pre-empts the question by walking you through this protocol on a tour, or that has it printed in the parent handbook, is a center that has done the work.

Exclusion rules — when an infant has to stay home

Most state daycare regulations defer to the AAP / NRC Managing Infectious Diseases in Child Care and Schools guide on exclusion rules. For RSV specifically, the standard is functional rather than diagnostic:

RSV alone — a child diagnosed by a clinician but with mild symptoms — does not require exclusion under AAP standards in most cases. The exclusion is based on how the child is doing, not on the diagnosis. This is the same approach the AAP takes for most common respiratory viruses; see also our companion guides on flu at daycare and the daycare illness policy.

When to call the pediatrician same-day

For an infant with confirmed or suspected RSV at home, AAP guidance is to call the pediatrician same-day for any of: trouble breathing or visible retractions (the skin pulling in between the ribs or above the collarbone with each breath); fewer than half the normal number of wet diapers; refusing to feed; lips, fingers, or tongue turning blue; a fever in an infant under 3 months of age; very fast breathing or grunting on exhale. Hospitals see a sharp uptick in RSV-related ED visits in December and January, and pediatrics offices are typically available for same-day phone triage during this window.

Practical things to ask your daycare director

• "What is your respiratory virus protocol during RSV season?"
• "How do you handle staff who come in with cold symptoms? Do you offer paid sick time?"
• "What does the infant-room cleaning schedule look like during November to March?"
• "What is your exclusion threshold for fever and respiratory symptoms? Where is that written?"
• "How quickly do you notify parents of confirmed RSV in the classroom?"

There is no "RSV-free" daycare. There are daycares that have done the operational thinking and daycares that have not. Asking these five questions sorts them in under ten minutes.

What this means for families weighing the start date

For families with a fall- or winter-born infant deciding when to start daycare, the RSV calendar is one of several considerations. Pediatricians often recommend, when possible, delaying the daycare start until after 3 to 6 months of age and after nirsevimab or maternal vaccine protection is in place. This is one factor among many — including parental leave, finances, and waitlist timing — and is not always feasible. Our guide on starting daycare at 6 weeks walks through the trade-offs in detail.

If you live in a major metro like New York, Chicago, or Boston, RSV peaks tend to align with the standard November-to-February window. CDC's RSV-NET dashboard tracks the season in near-real time and is the cleanest data source for parents who want to know what week of the season they are in.

For the broader picture on daycare illness, the quality and safety pillar covers exclusion policies, vaccine requirements, and what to look for in a center's sick-child plan.