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AY.4.2, a sublineage of the Delta variant, was considered a variant under investigation (VUI) and also gained the nickname \u201cDelta Plus,\u201d\u00a0due to its extra mutations, Y145H and A222V. In this study, using genomic epidemiology, we provide the first insights into the introduction of AY.4.2 in Bulgaria and the AY.4.2.1 sublineage that found larger dissemination only in Bulgaria and the United Kingdom.<\/jats:p>","DOI":"10.1002\/jmv.28033","type":"journal-article","created":{"date-parts":[[2022,7,29]],"date-time":"2022-07-29T03:24:52Z","timestamp":1659065092000},"page":"6060-6064","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Initial introduction and spread of the SARS\u2010CoV\u20102 AY.4.2.1 Delta variant in Bulgaria, a genomic insight"],"prefix":"10.1002","volume":"94","author":[{"given":"Ivailo","family":"Alexiev","sequence":"first","affiliation":[{"name":"National Center of Infectious and Parasitic Diseases Sofia 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