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MMWR weeks
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    The MMWR week is the week of the epidemiologic year for which the National Notifiable Diseases Surveillance System (NNDSS) disease report is assigned by the reporting local or state health department for the purposes of MMWR disease incidence reporting and publishing. Values for MMWR week range from 1 to 53, although most years consist of 52 weeks.

    MMWR week supports reporting of notifiable infectious disease incidence data at the national level. Some states may assign MMWR week for data management or reporting purposes more so than for monitoring ‘true’ disease incidence. Since MMWR week may be based on any of several dates relevant to calculating disease incidence and that assignment may vary by state or condition, analyses defining temporal notifiable disease incidence patterns should determine whether analysis by MMWR week or another epidemiologically-relevant date type is more appropriate for their needs.

    MMWR week is used to support public health reporting in the MMWR weekly morbidity tables and the annual Summary of Notifiable Diseases, United States. Historically, MMWR week has supported aggregated reporting of notifiable disease incidence (e.g., during the transition from hard-copy reporting to NETSS).

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