Report date: January 06, 2026
Note: For MMWR year 2025, MMWR week 1 started on 12/29/2024. For MMWR year 2026, MMWR week 1 starts on 1/4/2026.
*Vaccination status is defined as receiving at least one dose of MMR or MMRV vaccine.
*Defined as admission to a hospital. Visits to an emergency department without admission are not counted as hospitalizations.