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<H1>[Utilities-announce] Updated PubMed E-Utilities Now Live!</H1>
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<B>utilities-announce at ncbi.nlm.nih.gov</B>
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<A HREF="mailto:utilities-announce%40ncbi.nlm.nih.gov?Subject=Re%3A%20%5BUtilities-announce%5D%20Updated%20PubMed%20E-Utilities%20Now%20Live%21&In-Reply-To=%3Cmailman.14808.1669646473.4504.utilities-announce%40ncbi.nlm.nih.gov%3E"
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TITLE="[Utilities-announce] Updated PubMed E-Utilities Now Live!">utilities-announce at ncbi.nlm.nih.gov
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<I>Mon Nov 28 09:41:09 EST 2022</I>
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<PRE>Updated PubMed E-Utilities Now Live!
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We’ve launched the updated version of E-Utilities API for PubMed. Thank you to all who tested the updated API on the test server and provided feedback.
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This updated version now aligns the functions of the E-utilities with the web version of PubMed<<A HREF="https://pubmed.ncbi.nlm.nih.gov/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=pubmed-eutilities-live-20221122">https://pubmed.ncbi.nlm.nih.gov/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=pubmed-eutilities-live-20221122</A>> released in 2020. For example, search results returned by the updated ESearch E-utility<<A HREF="https://www.ncbi.nlm.nih.gov/books/NBK25499/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=pubmed-eutilities-live-20221122#chapter4.ESearch">https://www.ncbi.nlm.nih.gov/books/NBK25499/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=pubmed-eutilities-live-20221122#chapter4.ESearch</A>> will now match those of web PubMed. To be clear, this update only affects E-utility calls with &db=pubmed. The behavior of all other Entrez databases will not change.
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Why did NCBI do this?
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NCBI released this new API version to provide both consistent behavior for both web and API PubMed interfaces, as well as more reliable performance. To accomplish this, we transferred all E-utility functions to the technology stack that supports web PubMed, so that all PubMed requests use the same stack. This means that previous version of the PubMed E-utilities is no longer available, but that the new version provides the benefits listed above
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Have the URLs for PubMed E-utility calls changed?
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Previous E-utility URLs for PubMed (&db=pubmed) will continue to function with this updated release, with one exception. To obtain more than 10,000 PubMed records, consider using <EDirect>, which now contains additional logic to batch PubMed search results automatically so that an arbitrary number can be retrieved. See our updated documentation<<A HREF="https://www.ncbi.nlm.nih.gov/books/NBK25499/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=pubmed-eutilities-live-20221122#chapter4.ESearch">https://www.ncbi.nlm.nih.gov/books/NBK25499/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=pubmed-eutilities-live-20221122#chapter4.ESearch</A>> for more details.
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Has the output of PubMed E-utility calls changed?
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Again, in almost all cases, no. Here are the exceptions:
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* ESearch<<A HREF="https://www.ncbi.nlm.nih.gov/books/NBK25499/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=pubmed-eutilities-live-20221121#chapter4.ESearch">https://www.ncbi.nlm.nih.gov/books/NBK25499/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=pubmed-eutilities-live-20221121#chapter4.ESearch</A>> will now return the same PubMed IDs (PMIDs) that are currently returned by web PubMed
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* EFetch <<A HREF="https://www.ncbi.nlm.nih.gov/books/NBK25499/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=pubmed-eutilities-live-20221121#chapter4.EFetch">https://www.ncbi.nlm.nih.gov/books/NBK25499/?utm_source=ncbi_insights&utm_medium=referral&utm_campaign=pubmed-eutilities-live-20221121#chapter4.EFetch</A>>will now return XML data by default (&retmode is not set) rather than ASN.1. In other words, the default value of &retmode will become “xml”.
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What should I do if I have trouble using the new API?
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Write to us<mailto:<A HREF="http://www.ncbi.nlm.nih.gov/mailman/listinfo/utilities-announce">info at ncbi.nlm.nih.gov</A>?subject=NCBI%20Insights%20PubMed%20API%2020210929>  if you have any questions or concerns.
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