Abstract
In 2022-2024, three outbreaks of sheeppox (SPP) were reported in the European Union. These occurred in Spain, Bulgaria, and Greece and had serious economic consequences due to animal losses and trade restrictions. Five sheeppox virus (SPPV) whole-genome sequences (WGSs) were determined from samples collected during these outbreaks and analyzed in the context of all other published WGSs. Sheeppox virus strains can be divided in two, or possibly three, main groups. The isolates from the recent outbreaks belong to clade A2, which includes strains historically circulating in the Middle East and Northern Africa. Sequence divergence was low among the isolates that caused the recent European outbreaks. These results highlight the need for more regular and dense surveillance in under-sampled areas and the use of WGS to increase the chance of pinpointing the origin of an introduction, identifying potential introduction routes, and providing insights into SPPV evolution.
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