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- W2037239097 abstract "Porcine circovirus type 2 (PCV2) has been associated with a newly identified and described disease in swine called the postweaning multisystemic wasting syndrome (PMWS). An association of PCV2 with various other clinical conditions in pigs are also increasingly being reported. To date molecular studies to determine the extent of genetic variations of this virus have been limited. To more fully understand the extent of genetic diversity we report the sequencing of 34 PCV2 strains from Eastern Canada originating from a variety of clinical conditions spanning years 1990-2001 along with the phylogenetic analysis of these strains and that of 36 PCV2 sequences published in GenBank. Sequence analysis of the complete genome indicated that the Canadian PCV2 strains analyzed in the present study are closely related to each other but also to other PCV2 strains originating from Western Canada, US, Europe and Asia. Sequence analysis of ORF1 and ORF2 genes of the 34 strains revealed that the extent of nucleotide variation was greater for the ORF2 than for the ORF1. The amino acid sequences alignment of the PCV2 capsid protein identified three major regions of amino acid heterogeneity, two of which correspond with dominant immunoreactive areas. No repeatable amino acid motifs for these two regions could be associated with PCV2 strains identified from cases of PMWS or other clinical conditions. Phylogenetic analysis of all 70 strains revealed one large cluster composed of strains from Europe, Taiwan, China and Canada. This large cluster could be divided in several sub clusters, in two of which Canadian strains were found closely related to strains from Germany. The remaining strains from Canada and the US were spread in small groupings along the phylogenetic tree and an association with geographic origin could not be established. The genomic characterizations performed in this study indicate that PCV2 strains associated with PMWS are scattered throughout the phylogenetic tree often in groupings including PCV2 strains identified from cases other that PMWS such as, porcine reproductive and respiratory syndrome (PRRS), generalized tremors, porcine dermatitis and nephropathy syndrome (PDNS), arthritis, nervous signs, erysipelas and even healthy pigs." @default.
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- W2037239097 date "2002-12-01" @default.
- W2037239097 modified "2023-10-01" @default.
- W2037239097 title "Genetic characterization and phylogenetic analysis of porcine circovirus type 2 (PCV2) strains from cases presenting various clinical conditions" @default.
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- W2037239097 doi "https://doi.org/10.1016/s0168-1702(02)00141-7" @default.
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