The CDC uses a unique "Morbidity and Mortality Weekly Report" identifier for each week that starts at 1 (Ref: <>). This data frame consists of 4 columns:

  • wk_start: Start date (Sunday) for the week (Date)

  • wk_end: End date (Saturday) for the week (Date)

  • year_wk_num: The week of the calendar year

  • mmwrid: The unique MMWR identifier These can be "left-joined" to data provided from the CDC to perform MMWR identifier to date mappings.


A data frame with 4,592 rows and 4 columns