[Molecular-genetic analysis of the genomes of porcine reproductive and respiratory syndrome virus and porcine circovirus type 2 circulating in the area of Russian Federation].

The molecular genetic analysis of the genomes of the virus of porcine reproductive respiratory syndrome (VPRRS) and porcine circovirus type 2 (PCV-2) circulating in the area of the Russian Federation was discussed. The results of this work showed the circulation of the strains of the European genotype VPRRS similar to those found in France and Denmark from 1998 to 2001. The homology of the fragment of one of the genes between the Russian isolates and the vaccine strain Porcilis PRRS (Intervet) was found. It requires further study. The strains representing the North American genotype VPRRS were not found. The PCV-2 genomes fall into three separate goups. One (genotype 2b) is formed by isolates in Malaysia, Brazil, Switzerland, China, Slovakia, UK, USA, isolated during the period from 2004 to the present time. The second group consists of sequences of the viruses isolated in 2000-2012 in Canada, the U.S., China, and South Korea (genotype 2a). The third group is formed by highly pathogenic isolates in 2013 from China (highly pathogenic genotype 2c). The circulation of all three known genotypes of PCV-2: 2a, 2b, and 2c in Russian Federation was demonstrated.

[Molecular-genetic analysis of the field isolates of avian leucosis viruses in the Russian Federation].

Results of monitoring of different subtypes of avian leukosis virus (ALV) from commercial poultry farms in 14 regions of Russian Federation were discussed. Only three regions were found to be negative. ALV was detected in other 11 regions in 46-64% cases (for different regions). The phylogenetic analysis of the genomes for the 12 field isolates of ALV was carried out in different regions of Russian Federation. The isolates belong to different subtypes of the virus and form two large groups. The genomic differences between Russian and foreign isolates within each group range from 5% to 10%.

[Epitope mapping of antigenic determinants of E2 glycoprotein from classical swine fever virus using synthetic peptides].

Epitope mapping of the major envelope glycoprotein E2 of classical swine fever virus (CSFV) is important for our understanding of E2 and also for development of the CSFV-specific diagnostic assays and epitope- or peptide-based marker vaccines. Previous competitive binding studies showed that monoclonal antibodies raised against E2 protein of CSFV detected 8 individual epitopes. At the present study using a set of synthetic peptides covering the full sequences of E2 glycoprotein five linear non-overlap B-cells epitopes were identified. The identified sequences of 12 strains of the CSFV and 5 other pestiviruses were aligned. The data obtained could be useful for improvement of the CSFV diagnostic systems and studies of amino acid substitutions and their influence on antigenic properties of the CSFV E2 protein.

[Isolation of noncytopathogenic genotype 2 bovine viral diarrhea virus from the cattle mucosa in the Russian Federation].

The paper presents the results of genotyping and phylogenetic analysis of three noncytopathogenic isolates of bovine viral diarrhea virus from the mucosae of the cattle with different clinical presentations of the disease. On the basis of the phylogenetic analysis of high-conserved and variable virus genome regions (5'-UTR, N(pro), and E2), the authors referred two isolates to as genotype 1, subgenotypes 1b and 1d, and the third isolate to as genotype 2. This is the first communication about the isolation of genotype 2 virus in Russia.