Bexsero Dosing Interval for 2-Year-Olds
For a 2-year-old child, the interval between the first and second doses of Bexsero is 6 months (0 and 6 months schedule). 1
FDA-Approved Dosing Schedule
The FDA label for Bexsero specifies two dosing options 1:
- Two-dose schedule: Administer doses at 0 and 6 months
- Three-dose schedule: Administer doses at 0,1-2, and 6 months
If the second dose is given earlier than 6 months after the first dose, a third dose must be administered at least 4 months after the second dose. 1
Important Context and Caveats
Age Limitation
Bexsero is FDA-approved only for individuals aged 10-25 years 1. Use in a 2-year-old is considered off-label 2. The ACIP guidelines do not provide specific recommendations for routine MenB vaccination in 2-year-olds unless they have specific risk factors.
Risk-Based Considerations
The choice between the 2-dose and 3-dose schedule depends on:
- The individual's risk of exposure to meningococcal disease
- The child's susceptibility to meningococcal serogroup B disease 1
For children at increased risk (e.g., complement deficiency, asplenia, HIV infection), the 3-dose schedule may be more appropriate to ensure optimal protection.
Recent Updates (October 2024)
The FDA recently updated the Bexsero label to extend the interval from ≥1 month to 6 months between doses, based on new immunogenicity data showing improved antibody responses with the longer interval 3. This change aligns Bexsero dosing with the other licensed MenB vaccine (Trumenba).
Clinical Pitfall
Do not interchange Bexsero with other meningococcal group B vaccines to complete the vaccination series, as there are insufficient data on safety and effectiveness of interchangeability 1.