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The dramatic event occurred during calving season when females and young males stop migrating and form massive aggregations for calving purposes.  With 100% morbidity and 100% mortality of affected herds observed, the 2015 die-off left the largest saiga population, Betpak-Dala, with approximately 30,000 survivors based on post mortality census, highlighting the imminent extinction threats to this critically endangered species. \n\nThe lack of pathological investigations during historical mass mortality events has limited our understanding of disease-related mortalities in saiga antelope. Generally, aetiological agents were isolated from dead saiga, but the disease course and a full necropsy were not performed nor present in the records. However, for the first time, a full pathology report was possible during 2015.","distributionFormats":[{"name":"Semi-colon delimited text","version":"unknown"}],"distributorContacts":[{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"distributor","email":"info@eidc.ac.uk"}],"id":"30cbfba7-f9a1-47d5-abdb-f2741041e487","incomingCitationCount":0,"infoLinks":[{"url":"https://data-package.ceh.ac.uk/sd/30cbfba7-f9a1-47d5-abdb-f2741041e487.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset","function":"information","type":"OTHER"}],"inspireThemes":[{"theme":"Species Distribution","uri":"http://inspire.ec.europa.eu/theme/sd"}],"keywordsOther":[{"value":"Saiga antelope"}],"keywordsPlace":[{"value":"Kazakhstan","uri":"http://sws.geonames.org/1522867"},{"value":"Tengiz","uri":"http://sws.geonames.org/1484290"}],"licences":[{"value":"This resource is made available under the terms of the Open Government Licence","code":"license","uri":"https://eidc.ac.uk/licences/ogl/plain"}],"lineage":"Sixteen saiga carcasses were necropsied in Tengiz Oblast (thirteen adults and three new-borns), and eighteen carcasses in Turgai Oblast (twelve adults and six new-borns). Field necropsy procedures were followed according to: Munson, L., Necropsy of Wild Animals. University of California. 2006. \n\nSamples were fixed in formal saline and shipped and processed at the Royal Veterinary College (RVC), UK. Samples from Turgai were processed at RVC and from Tengiz were processed initially at the Research Institute for Biological Safety Problems (RIBSP), Kazakhstan and re-processed at the RVC. Sample and slide preparation at the RVC is described in  Martineau, H.M. Histopathology of Tissues from Saiga Antelope: Turgai. Pathology and Pathogen Biology Department, Royal Veterinary College of London, UK.\n\nSamples were analysed at the RVC and then sent to the Forest School of Medicine, NC, USA for review. 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