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<td colspan="5"><span class="issueDateMenu" >2009 NOVEMBER&#8211;DECEMBER</span> <span class="issueNum">No. 371</span>
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<div class="actions">December 18, 2009 <span class="status">[posted]</span>
</div>
<h1>What's New for 2010 MeSH<span class="registered">&#174;</span></h1>
<div>
<table border="1" width="175" cellpadding="5" align="right" cellspacing="0" id="sidebar">
<tr><td>
Other pertinent articles:<br /><br />
<a href="/pubs/techbull/so09/so09_yep.html">MEDLINE/PubMed Year-End Processing Activities</a><br /><br />
<a href="/pubs/techbull/so09/so09_2010_mesh_avail.html">2010 MeSH Now Available</a><br /><br />
<a href="/pubs/techbull/so09/so09_2010_mesh_download.html">2010 MeSH Files Available for Download</a><br /><br />
<a href="/pubs/techbull/nd09/nd09_cataloging_news.html">Cataloging News 2010</a><br /><br />
<a href="/pubs/techbull/nd09/nd09_medline_data_changes_2010.html">MEDLINE Data Changes &#151; 2010</a><br /><br />
<a href="/pubs/techbull/nd09/nd09_pm_notes.html">PubMed Notes — 2010</a><br /><br />
<a href="/pubs/techbull/nd09/nd09_new_system.html">Newly Maintained MEDLINE for 2010 MeSH Now Available in PubMed</a><br /><br />
<img src="/pubs/techbull/mj07/graphics/blutri.gif" alt="dot" height="10" width="10"/> What's New for 2010 MeSH<br /><br />
<a href="/pubs/techbull/nd09/nd09_mesh_category_b.html">2010 MeSH Category B Restructuring</a><br /><br />
</td></tr>
</table>
</div>
<h2>Overview of Vocabulary Development and Changes for 2010 MeSH</h2>
<ul>
<li>422 Descriptors added </li>
<li>52 Descriptor terms replaced with more up-to-date terminology </li>
<li>20 Descriptors deleted </li>
</ul>
<h2>Totals by Type of Terminology</h2>
<ul>
<li>25,588 Descriptors </li>
<li>83 Qualifiers </li>
<li>186,686 Supplementary Concept Records (SCRs)</li>
</ul>
<h2>Helpful Links</h2>
<p>
Please consult the 2010 online <a href="/mesh/introduction.html">Introduction to MeSH</a> for more details. Lists of new and changed vocabulary are available at these links: </p>
<dl>
<dd><a href="//www.nlm.nih.gov/mesh/intro_voc_change.html">MeSH Vocabulary Changes</a> </dd>
<dd><a href="//www.nlm.nih.gov/mesh/newd.html">New Descriptors - 2010</a></dd>
<dd><a href="//www.nlm.nih.gov/mesh/prefterm_change.html">Changed Descriptors - 2010</a> </dd>
<dd><a href="//www.nlm.nih.gov/mesh/deleted.html">Deleted Descriptors - 2010</a> </dd>
<dd><a href="//www.nlm.nih.gov/mesh/newbysub.html">New Descriptors by Tree Subcategory - 2010</a></dd>
</dl>
<p>In addition, files of MeSH 2010 vocabulary are also available for <a href="//www.nlm.nih.gov/mesh/filelist.html">downloading</a>.
</p>
<h2>
Major Tree Revisions</h2>
<p>
For 2010 MeSH, the Category B (Organisms Tree) was reorganized to include specific taxonomic descriptors for the third domain of life (Eukaryota). The descriptor Protozoa, formerly under Invertebrates, was deleted because it has become an outmoded phylogenetic concept. The vast majority of new descriptors treed under Eukaryota comprise most of the organisms that were previously treed under the old Protozoa.
</p>
<p>
The 20th century classification of Protozoa emphasized modes of nutrition and locomotion; 21st century classification is based on ultrastructure, biochemistry, and genetics. Most of the organism descriptors that were treed under Protozoa are now treed under Eukaryota, some under different taxonomic names. Note these organisms are no longer treed under Animals and will not get the check tag Animals; they are simply eukaryotes. Common usage of the word "protozoan" still exists in the literature, though it is diminishing; for now we are going to retain the other MeSH descriptors with the word "Protozoan." Thus the headings Protozoan Infections, Protozoan Genes, and Protozoan Proteins, etc. have not changed.
</p>
<p>
For more detailed information on these changes see <a href="/pubs/techbull/nd09/nd09_mesh_category_b.html"><em>2010 MeSH® Category B Restructuring</em></a> and <a href="/pubs/techbull/nd09/nd09_medline_data_changes_2010.html"><em>MEDLINE® Data Changes &#151; 2010</em></a>.
</p>
<h2>
H1N1 Virus</h2>
<p>
Influenza A Virus, H1N1 Subtype for the causative agent of what is colloquially called "swine flu." It has entry terms H1N1 Virus and Swine-Origin Influenza A H1N1 Virus. The disease coordinate for H1N1 in humans is Influenza, Human. There are no references to "swine flu" in MeSH due to its ambiguous meaning (analogous to "bird flu"). For more indexing details, see <a href="/pubs/techbull/mj09/mj09_swine_flu.html"><em>2009 H1N1 Flu ("Swine Flu") Terminology</em></a>.
</p>
<a name="rare">&nbsp;</a>
<h2>Rare Diseases</h2>
<p>
Under an agreement with the NIH Office of Rare Diseases and Research (ORDR), the list of rare disease terms maintained by that office is being merged into the MeSH vocabulary.
<!--The editing interface for MeSH has been modified to allow the ORDR staff to add new rare diseases, while MeSH analysts work to integrate the rare diseases into MeSH. It appears that some of the diseases will merge nicely into subject headings, but that others may require additional work. For the present, these are being added as a new class of Supplementary Concept Records (SCR), thus allowing further editing to take place in the MeSH maintenance environment. For this reason, classes for SCR records were created. Chemicals will be Class 1, chemotherapy protocols Class 2, and the rare diseases Class 3.
Of the initial load of 10,379 ORDR terms into MeSH (10,379 ORDR terms in 3,571 records), the majority of these rare disease names (9,047 terms in 3,453 records) will remain in MeSH 2010 as Supplementary Concept Records (SCR) Class 3. -->
During the initial review process of 10,379 ORDR terms, 1,332 ORDR terms were deleted because they were abbreviations of fewer than five letters and therefore would have created ambiguity if included in MeSH. A total of 274 ORDR terms were merged with existing descriptors in MeSH 2010. This increase is in addition to the 440 ORDR terms that were identified as being already in MeSH 2010 descriptors. <!--These terms were tagged appropriately (TH=ORDR (2010)).--> An additional 372 ORDR terms were identified during this review process to be merged with MeSH 2011 descriptors. The remainder are targeted to be Supplementary Concept Records (Class 3) in MeSH 2011. Each of these rare disease SCR records will be mapped to (Heading Mapped to) at least one current MeSH disease term to help future searches and indexing.
</p>
<p>
For example, ORDR disease term Myotonia Congenita matches the existing MeSH descriptor Myotonia Congenita (D009224). The ORDR related term Thomsen Disease is an Entry Term for Myotonia Congenita. See <a href="#fig1">Figure 1</a>; note the ORDR terms are identified by the label Thesaurus with a value of ORD (2010). This particular concept will have additional edits targeted for the 2011 MeSH.
</p>
<!--<p>
For example, ORDR disease term Becker Disease (C535760) lists the following related terms: Batten Turner congenital myopathy; Myotonia congenita, autosomal dominant; and Congenital myopathy. Of these Becker disease and Batten Turner congenital myopathy will be merged with Becker Generalized Myotonia, a concept in the MeSH descriptor Myotonia Congenita (D009224). Batten Turner congenital myopathy and Myotonia congenita, autosomal dominant, on the other hand, will be merged with Generalized Myotonia of Thomsen, another related concept in the same descriptor (see <a href="#fig1">Figure 1</a>). The term Congenital myopathy, however, will not become a part of the MeSH descriptor and may remain in the SCR because of its ambiguity. The expanded concept view indicates which terms originated from the ORDR list of terms.
</p>
-->
<div class="figure" style="width: 624px;"> <a name="fig1" id="fig1"><img src="graphics/mesh_fig1.gif" alt="Screen capture of Myotonia Congenita, MeSH Browser 2010, Expanded Concept View Showing ORD as a New Thesaurus Value." title="Screen capture of Myotonia Congenita, MeSH Browser 2010, Expanded Concept View Showing ORD as a New Thesaurus Value" width="622" height="1460" /><br /> <strong>Figure 1: Myotonia Congenita, MeSH Browser 2010, <br />Expanded Concept View Showing ORD as a New Thesaurus Value.</strong></a> </div>
<p class="authors">
By
Jacque-Lynne Schulman<br />
MeSH Section<br />
</p>
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<!--************************CHANGE CITATION INFORMATION BELOW*****************************-->
<p class="citation">Schulman JL. What's New for 2010 MeSH<span class="registered">&#174;</span>. NLM Tech Bull. 2009 Nov-Dec;(371):e15. </p>
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