Appendix B - New York State Department of Health Immunization Policy on Minimum Intervals

Clarification of the minimum time interval between two doses of vaccine as stated by the Admisory Committee on Immunization Practices (ACIP) as one month or as four (4) weeks:

There is no immunologic response difference between one month, four (4) weeks, and 28 days. Therefore, a minimum of 28 days between any two doses of vaccine is acceptable. Revaccination of a child should occur only in the case of the minimum interval being less than 28 days.


Debra S. Blog, M.D., Medical Director

David R. Lynch, Immunization Program Manager