Morbidity and Mortality Weekly Report

The Morbidity and Mortality Weekly Report (MMWR) is a series of epidemiological science periodicals published by the United States Centers for Disease Control and Prevention (CDC). The MMWR series comprises 4 publications: the Weekly Report (MMWR Weekly), published weekly on Thursdays, and 3 titles presenting longer-form reports published on an ad hoc basis: MMWR Recommendations and Reports, MMWR Surveillance Summaries, and MMWR Supplements. MMWR was originally established as Weekly Health Index in 1930, changing its title to Weekly Mortality Index in 1941 and Morbidity and Mortality in 1952. It acquired its current name in 1976. It is the main vehicle for publishing public health information and recommendations that have been received by the CDC from state health departments. Material published in the report is in the public domain and may be reprinted without permission. As of 2026, the journal’s acting is Leonard Jack, who also serves as editor-in-chief of the CDC's peer-reviewed journal Preventing Chronic Disease.

According to , 2025 2-year impact factors for the MMWR series (and rankings out of 443 publications in the “Public, Environment and Occupation Health’ category) were

• Morbidity and Mortality Weekly Report: 16.2 (rank 7th)
• Surveillance Summaries: 96.9 (rank 1st)
• Recommendations and Reports: 51.3 (rank 2nd)

MMWR Supplements was not given a 2025 impact factor.