Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

This is a preview of updates coming to the Technical Bulletin's website in early December 2025. Return to current site.
Read more about the modernization release schedule in this announcement.
Comment via the yellow feedback button in the lower right hand corner of the page. Contact the NLM Help Desk with any questions or concerns.

This is archived content.

Links may have become inactive over time. Visit Archive-It   to find the original published layout.

MEDLINE®/PubMed® Year-End Processing Activities

MEDLINE®/PubMed® Year-End Processing Activities. NLM Tech Bull. 2009 Sep-Oct;(370):e3.

September 03, 2009 [posted]

The National Library of Medicine® (NLM®) is currently involved in MEDLINE year-end processing (YEP) activities. These include changing the Medical Subject Headings (MeSH®) and Supplementary Concept Substance Names on existing MEDLINE citations to conform with the 2010 version of MeSH, and other global changes.

Important Dates

  • November 18, 2009: NLM expects to temporarily halt the addition of fully-indexed MEDLINE citations to PubMed.

  • Mid-December 2009: The PubMed MEDLINE citations, translation tables, and the MeSH database will have been updated to reflect 2010 MeSH.


For details about the impact on searching from November 18 to mid-December, see: Annual MEDLINE®/PubMed® Year-End Processing (YEP): Impact on Searching During Fall 2009.

For background information on the general kinds of changes made annually, see: Annual MEDLINE®/PubMed® Year-End Processing (YEP): Background Information.