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Administration Errors: RSV for Infants

Administration Errors: RSV for Infants

On November 30, CDC alerted immunization programs that they have received reports of infants being mistakenly administered RSV vaccines intended for adults. Infants should only receive the RSV preventive antibody, nirsevimab (Beyfortus, Sanofi).

RSV vaccines (Arexvy by GSK and Abrysvo by Pfizer) are recommended only for adults and have not been evaluated for safety or effectiveness in infants or children. Practices that carry both adult RSV vaccine and pediatric RSV preventive antibody products should review their immunization administration safety procedures to ensure only the correct product is administered to recipients. This is an opportunity to re-educate and re-train staff on RSV immunization formulations and practices.

In the event that a vaccine administration involving RSV vaccine occurs, CDC encourages vaccinators to promptly report errors to the Vaccine Adverse Event Reporting System (VAERS). Also, inform parents of error so that these infants can receive the correct product and be monitored for adverse reactions. 

CDC Clinical Guidance (updated December 7, 2023)

Because there are no data on the efficacy/effectiveness of RSV vaccines in preventing RSV disease in this age group, the infant should receive nirsevimab if otherwise eligible based on maternal RSV vaccination status. There is no specific recommendation for a minimum interval between administration of incorrect RSV vaccine and nirsevimab. Some experts suggest:

• That it could be reasonable to consider waiting 48 to 72 hours before proceeding with nirsevimab administration. This time frame is when we would expect side effects to the RSV vaccine, such as fussiness, would be most likely.

• Consideration should be given to administering nirsevimab in the limb opposite to where the RSV vaccine was administered to avoid potential interaction or binding of RSV antibody and vaccine, thereby reducing the effectiveness of nirsevimab.

If further clinical guidance is needed, connect with our medical experts at or CDC experts at