{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T16:03:21Z","timestamp":1790870601849,"version":"4.1.0"},"reference-count":109,"publisher":"MDPI AG","issue":"23","license":[{"start":{"date-parts":[[2022,11,29]],"date-time":"2022-11-29T00:00:00Z","timestamp":1669680000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Animals"],"abstract":"<jats:p>Piroplasmoses in sheep are caused by vector-borne apicomplexan protozoa, Babesia and Theileria. Different species are responsible for the disease; some species are more pathogenic than others and have a worldwide distribution. In this sense, these causative agents can cause anaemia in flocks. In general, these vector-borne diseases infect small ruminants and cause host-mediated pathology. In the case of Babesia species, a combination of different mechanisms is involved: red blood cell lysis due to intracellular parasite multiplication, activation of biogenic amines and the coagulation system with the possibility of disseminated intravascular coagulation. By contrast, less information is available on the different immunopathogenic mechanisms involved in the development of anaemia in sheep with theileriosis. However, the mechanisms of pathogenic action in theileriosis are similar to those studied in babesiosis. Diagnosis is based on compatible clinical signs, laboratory findings, specific diagnostic tests and the presence of the tick vector. Some of these tests detect the causative agent itself, such as direct identification by light microscopy and molecular analysis. In contrast, other tests detect the sheep\u2019s immune response to the organism by serology. Both diseases pose a significant diagnostic challenge for veterinary practitioners around the world. This review presents the most frequent clinical signs, pathogenesis and clinicopathological findings, diagnosis.<\/jats:p>","DOI":"10.3390\/ani12233341","type":"journal-article","created":{"date-parts":[[2022,11,30]],"date-time":"2022-11-30T03:49:13Z","timestamp":1669780153000},"page":"3341","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Anaemia in Sheep Caused by Babesia and Theileria Haemoparasites"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6209-4282","authenticated-orcid":false,"given":"Sergio","family":"Villanueva-Saz","sequence":"first","affiliation":[{"name":"Animal Pathology Department, Instituto Agroalimentario de Arag\u00f3n-IA2 (Universidad de Zaragoza-CITA), Facultad de Veterinaria, C\/Miguel Servet 177, 50013 Zaragoza, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0680-9957","authenticated-orcid":false,"given":"Marta","family":"Borobia","sequence":"additional","affiliation":[{"name":"Animal Pathology Department, Instituto Agroalimentario de Arag\u00f3n-IA2 (Universidad de Zaragoza-CITA), Facultad de Veterinaria, C\/Miguel Servet 177, 50013 Zaragoza, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2557-4890","authenticated-orcid":false,"given":"Antonio","family":"Fern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Animal Pathology Department, Instituto Agroalimentario de Arag\u00f3n-IA2 (Universidad de Zaragoza-CITA), Facultad de Veterinaria, C\/Miguel Servet 177, 50013 Zaragoza, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Calasanz","family":"Jim\u00e9nez","sequence":"additional","affiliation":[{"name":"Animal Pathology Department, Instituto Agroalimentario de Arag\u00f3n-IA2 (Universidad de Zaragoza-CITA), Facultad de Veterinaria, C\/Miguel Servet 177, 50013 Zaragoza, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andr\u00e9s","family":"Yzuel","sequence":"additional","affiliation":[{"name":"Animal Pathology Department, Instituto Agroalimentario de Arag\u00f3n-IA2 (Universidad de Zaragoza-CITA), Facultad de Veterinaria, C\/Miguel Servet 177, 50013 Zaragoza, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda Teresa","family":"Verde","sequence":"additional","affiliation":[{"name":"Animal Pathology Department, Instituto Agroalimentario de Arag\u00f3n-IA2 (Universidad de Zaragoza-CITA), Facultad de Veterinaria, C\/Miguel Servet 177, 50013 Zaragoza, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda \u00c1ngeles","family":"Ramo","sequence":"additional","affiliation":[{"name":"Animal Pathology Department, Instituto Agroalimentario de Arag\u00f3n-IA2 (Universidad de Zaragoza-CITA), Facultad de Veterinaria, C\/Miguel Servet 177, 50013 Zaragoza, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luis","family":"Figueras","sequence":"additional","affiliation":[{"name":"Animal Pathology Department, Instituto Agroalimentario de Arag\u00f3n-IA2 (Universidad de Zaragoza-CITA), Facultad de Veterinaria, C\/Miguel Servet 177, 50013 Zaragoza, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8474-2831","authenticated-orcid":false,"given":"H\u00e9ctor","family":"Ru\u00edz","sequence":"additional","affiliation":[{"name":"Animal Pathology Department, Instituto Agroalimentario de Arag\u00f3n-IA2 (Universidad de Zaragoza-CITA), Facultad de Veterinaria, C\/Miguel Servet 177, 50013 Zaragoza, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,11,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Sim\u00f5es, J., and Guti\u00e9rrez, C. 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