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Notice to Readers: Enhanced Availability of Data for Nationally Notifiable Diseases

Provisional data for cases of selected diseases and conditions reported through the National Notifiable Diseases Surveillance System (NNDSS) by the 50 states, New York City, the District of Columbia, and U.S. territories are collated and published weekly in MMWR. Beginning with the January 10, 2014, issue, these data are now available at in various sortable, machine-readable formats that will make them more usable for analyses. Each weekly issue of MMWR includes a link that takes users to that week's dataset, from which they can link to the new formats.

Previously available options for downloading historical data also continue to be available. For example, a portable document format (PDF) version (and for most issues, a hypertext markup language [HTML] version) of the NNDSS tables for issues from 1994 to the present can still be downloaded from the MMWR website (, and a tab-delimited text file can be exported from CDC's WONDER system ( CDC WONDER contains NNDSS data from 1996 to the present. For older data, complete editions of MMWR volumes 1–30 can be downloaded in PDF format from CDC Stacks ( Third-party groups have been able to collect historical NNDSS data from MMWR and additional sources. An example of such an external collection is Project Tycho (

Users also should note that a report with final NNDSS data is published in a weekly issue of MMWR approximately 8 months after the end of the calendar year. The Summary of Notifiable Diseases — United States ( is published annually, approximately 18 months after the end of the calendar year.

Use of trade names and commercial sources is for identification only and does not imply endorsement by the U.S. Department of Health and Human Services.

References to non-CDC sites on the Internet are provided as a service to MMWR readers and do not constitute or imply endorsement of these organizations or their programs by CDC or the U.S. Department of Health and Human Services. CDC is not responsible for the content of pages found at these sites. URL addresses listed in MMWR were current as of the date of publication.

All MMWR HTML versions of articles are electronic conversions from typeset documents. This conversion might result in character translation or format errors in the HTML version. Users are referred to the electronic PDF version ( and/or the original MMWR paper copy for printable versions of official text, figures, and tables. An original paper copy of this issue can be obtained from the Superintendent of Documents, U.S. Government Printing Office (GPO), Washington, DC 20402-9371; telephone: (202) 512-1800. Contact GPO for current prices.

**Questions or messages regarding errors in formatting should be addressed to The U.S. Government's Official Web PortalDepartment of Health and Human Services
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