Key Messages
- Respiratory Syncytial Virus (RSV) transmission is continuing in California.
- CDPH recommends continuing RSV immunization of eligible infants and young children with RSV monoclonal antibody products through April 30, 2026.
- As of 3/7/2026, percent positivity for RSV in Orange County continues to increase week over week.
This health alert is issued to inform healthcare providers about the ongoing transmission in California of Respiratory Syncytial Virus (RSV), the most common cause for hospitalization in infants in the US. As RSV infections are likely to continue into April 2026, CDPH recommends continuing RSV immunization of eligible infants and young children with RSV monoclonal antibody products through April 30, 2026.
Advisory: CDPH Recommends Immunizing Infants with RSV Monoclonal Antibodies through April 2026, Given Ongoing RSV Disease Activity
