Med. Weter. 75 (5), 305-309, 2019

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Phylogenetic analysis of spring viremia of carp virus (SVCV) identified in Poland
Spring viremia of carp (SVC) is a disease caused by a virus belonging to the genus Vesiculovirus, family Rhabdoviridae. The SVC virus is divided into four genogroups, Ia, Ib, Ic, and Id, due to its geographical distribution. This study aimed to identify the genotype of the SVC virus circulating in Poland. Polish SVC virus isolates were propagated on EPC and FHM cell lines, and genetic material (RNA) was isolated. The virus was detected in test samples by reverse transcription, sequenced and analyzed using MEGA 6.06 software. The phylogenetic tree was constructed by the Neighbor-Joining method. The results of phylogenetic analysis revealed the presence of two genogroups of the SVC virus in Poland. Most of Polish isolates belonged to the genogroup Id, as do isolates AY196200 from the Czech Republic, Z37505 from Belgium and EF593149 from the United States. Only two Polish isolates from Silesian Voivodeship were more closely related to Chinese and US isolates belonging to the genogroup Ia. There were no isolates belonging to the genogroups Ib and Ic. Nucleotide sequence analysis revealed certain point mutations between particular isolates. Knowledge on the genetic variants of the SVC virus circulating in Poland will be useful in epizootic investigations and preventive measures to protect Polish aquaculture from new variants from the neighboring countries
Keywords: spring viremia of carp, phylogenetic analysis, cytopathic effect