January 5, 2024

Updated Guidance for Healthcare Providers on Increased Supply of Nirsevimab to Protect Young Children from Severe Respiratory Syncytial Virus (RSV) during the 2023–2024 

Respiratory Virus Season 

On October 23, 2023, the Centers for Disease Control and Prevention (CDC) issued Health Alert Network (HAN) Health Advisory 499 to provide guidance for prioritization of nirsevimab given limited supply. Nirsevimab (Beyfortus, Sanofi and AstraZeneca) is a long-acting monoclonal antibody immunization recommended for preventing RSV-associated lower respiratory tract disease in young children. Given the recent increase in nirsevimab supply and the manufacturers’ plan to release an additional 230,000 doses in January, CDC advises healthcare providers to return to recommendations put forward by CDC and the Advisory Committee on Immunization Practices (ACIP) on use of nirsevimab in young children. Infants and children recommended to receive nirsevimab should be immunized as quickly as possible. Healthcare providers should not reserve nirsevimab doses for infants born later in the season when RSV circulation and risk for exposure to RSV may be lower. RSV activity remains elevated nationwide and is continuing to increase in many parts of the country, though decreased activity has been observed in the Southeast. 
Recommendations for Healthcare Providers
  1. In the setting of increasing supply, healthcare providers should administer a single dose of nirsevimab to all infants aged less than 8 months, as well as children aged 8 through 19 months at increased risk.
    1. Healthcare providers should continue to work with their state immunization program and the manufacturer to order available nirsevimab doses. CDC is working closely with jurisdictional partners to ensure adequate supply through the Vaccines for Children Program. 
    2. Neither RSV vaccine (Pfizer Abrysvo, GSK Arexvy) is approved for use in infants or young children. Healthcare providers should take care to use the correct product for the correct population.
    3. Although supply of nirsevimab is expected to increase, available supply may continue to vary locally and by healthcare facility. For healthcare providers who continue to have limited supply, nirsevimab should be prioritized to protect infants at the highest risk for severe RSV disease using the following principles: first by high-risk conditions and then by age, prioritizing the youngest infants first.   
  2. Pregnant people 32 through 36 weeks gestation should receive RSV vaccination through January.
    1. Pfizer Abrysvo is the only RSV vaccine recommended for use in pregnant people. GSK Arexvy is not recommended for use in pregnant people.
  3. Administration of both nirsevimab and RSV vaccination for pregnant people is not needed to protect most infants. 
The Emergency Risk Communication Branch in the Division of Emergency Operations, Office of Readiness and Response is responsible for the management of all COCA Products. 
For information about this update or other clinical issues, or to send your feedback, please contact us at
Clinician Outreach and Communication Activity—resources for healthcare providers
COCA RSS Feed—subscribe to be notified of conference calls, updates, and CDC guidance for health providers
Crisis & Emergency Risk Communication Training—training program that draws from lessons learned during public health emergencies, and incorporates best practices from the fields of risk and crisis communication
Health Alert Network—CDC's primary method of sharing cleared information about urgent public health incidents with public information officers; federal, state, territorial, and local public health practitioners; clinicians; and public health laboratories

CDC and HHS logos are the exclusive property of the Department of Health and Human Services and may not be used for any purpose without prior express written permission. Use of trade names and commercial sources is for identification only and does not imply endorsement by the U.S. Department of Health and Human Services.

Links to non-federal organizations are provided solely as a service to our users. Links do not constitute an endorsement of any organization by CDC or the federal government, and none should be inferred. CDC is not responsible for the content of the individual organizations.

Centers for Disease Control and Prevention

1600 Clifton Rd   Atlanta, GA 30329   1-800-CDC-INFO (800-232-4636)   TTY: 888-232-6348
Questions or Problems  |  Unsubscribe