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Its transmission and pathogenesis are of interest in the study of retroviruses and are crucial for any conservation strategy geared toward koala health. This study provides new evidence on the modes of KoRV transmission from parent koalas to their joey. We found vertical transmission of KoRV-A, confirming its endogenization, but with closer conservation between the joey and its sire than its dam (previous reports on joeys are rare but have postulated dam-to-joey vertical transmission). This is also the first report of a KoRV-B-negative joey from KoRV-B-positive parents, contrasting with the few previous reports of 100% transmission of KoRV-B from dams to joeys. Thus, the results in this study give some novel insights for the transmission mode of KoRV.<\/jats:p>","DOI":"10.1128\/jvi.00019-20","type":"journal-article","created":{"date-parts":[[2020,3,16]],"date-time":"2020-03-16T12:02:51Z","timestamp":1584360171000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":23,"title":["Transmission of Koala Retrovirus from Parent Koalas to a Joey in a Japanese Zoo"],"prefix":"10.1128","volume":"94","author":[{"given":"Md Abul","family":"Hashem","sequence":"first","affiliation":[{"name":"Transboundary Animal Diseases Centre, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan"},{"name":"Laboratory of Animal Hygiene, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan"},{"name":"Department of Health, Chattogram City Corporation, Chattogram, Bangladesh"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fumie","family":"Maetani","sequence":"additional","affiliation":[{"name":"Hirakawa Zoological Park, Kagoshima, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohammad Enamul Hoque","family":"Kayesh","sequence":"additional","affiliation":[{"name":"Transboundary Animal Diseases Centre, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan"},{"name":"Laboratory of Animal Hygiene, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan"},{"name":"Department of Microbiology and Public Health, Patuakhali Science and Technology University, Barishal, Bangladesh"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Taiki","family":"Eiei","sequence":"additional","affiliation":[{"name":"Hirakawa Zoological Park, Kagoshima, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kyoya","family":"Mochizuki","sequence":"additional","affiliation":[{"name":"Hirakawa Zoological Park, Kagoshima, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ayaka","family":"Ito","sequence":"additional","affiliation":[{"name":"Hirakawa Zoological Park, Kagoshima, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroko","family":"Sakurai","sequence":"additional","affiliation":[{"name":"Hirakawa Zoological Park, Kagoshima, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takayuki","family":"Asai","sequence":"additional","affiliation":[{"name":"Hirakawa Zoological Park, Kagoshima, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kyoko","family":"Tsukiyama-Kohara","sequence":"additional","affiliation":[{"name":"Transboundary Animal Diseases Centre, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan"},{"name":"Laboratory of Animal Hygiene, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"235","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1128\/JVI.01871-17"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1292\/jvms.10-0250"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1128\/JVI.01584-12"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1304704110"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00705-016-3064-8"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00705-019-04149-5"},{"key":"e_1_3_2_8_2","doi-asserted-by":"publisher","DOI":"10.1093\/molbev\/msu275"},{"key":"e_1_3_2_9_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1751-0813.2012.00964.x"},{"key":"e_1_3_2_10_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-017-00137-4"},{"key":"e_1_3_2_11_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature04841"},{"key":"e_1_3_2_12_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00705-019-04392-w"},{"key":"e_1_3_2_13_2","doi-asserted-by":"publisher","DOI":"10.1128\/jvi.74.9.4264-4272.2000"},{"key":"e_1_3_2_14_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1751-0813.1998.tb12337.x"},{"key":"e_1_3_2_15_2","first-page":"1394","article-title":"Acute leukemia in a New South Wales koala (Phascolarctos c. cinereus)","volume":"21","author":"Heuschele WP","year":"1961","unstructured":"Heuschele WP, Hayes JR. 1961. 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