"One Month" as Defined by the American Committee on Immunization Practices (ACIP)

Have you ever wondered what the difference is between four weeks and one month when referring to the ACIP minimum interval table for vaccine administration? Does a one month minimum interval mean 28 days? 30 days? 31 days?

The newly revised ACIP Recommendation statement on Measles, Mumps, and Rubella defines one month as a "minimum of 28 days." (MMWR, 1998; 47:No.RR-8.)

Copies of the new MMWR Recommendation statement (or any ACIP statement) can be downloaded from CDC's website at www.cdc.gov/epo/mmwr/mmwr.html. You can also request a free electronic subscription to MMWR at this site. Or, call CDC's Immunization Hotline at 800.232.2522.

Last updated: November 23, 2000


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