West Nile virus is a flavivirus transmitted to humans mainly by mosquito bites. Outbreaks are observed in several European countries, and Greece is one of the most affected countries during the recent years. Thessaly was one of the most affected regions in Greece in 2019. A total of 3,025 Culex spp. mosquitoes collected in Thessaly were grouped into 47 pools and tested for West Nile virus (WNV). Eight (17%) pools were found positive. Whole genome sequences were obtained from two positive pools. Phylogenetic analysis showed that the causative strain was an evolutionary variant of the strains circulating in 2018 belonging to the Balkan subgroup of the Central European subclade of WNV lineage 2.

中文翻译：

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2019 年希腊色萨利库蚊中的西尼罗河病毒谱系 2。


西尼罗河病毒是一种黄病毒，主要通过蚊虫叮咬传播给人类。多个欧洲国家都出现疫情爆发，希腊是近年来受影响最严重的国家之一。色萨利是 2019 年希腊受影响最严重的地区之一。共有 3,025 只库蚊。在色萨利收集的蚊子被分为 47 个池，并进行西尼罗河病毒 (WNV) 检测。八个（17%）池被发现呈阳性。从两个阳性池中获得全基因组序列。系统发育分析表明，致病毒株是2018年流行毒株的进化变种，属于西尼罗河病毒谱系2中欧支系的巴尔干亚群。