RESUMO
Six strains of influenza AH5N1 virus were isolated, by using PS and MDCK continuous cell lines from poultry and wild birds, which were collected on July 28, 2005 in the samples taken from 5 examines species of wild birds in the Novosibirsk region during the epizootic outbreak with a high mortality. The strains were identified by means of HIT, RT-PCR, and microchip-based techniques. Two strains, A/Grebe/Novosibirsk/29/05 (H5N1) and A/Duck/Novosibirsk/56/05 (H5N1), were deposited to the Russian State Collection of Viruses (Registration Nos. 2372 and 2371, respectively) with the priority date 08.08.2005. Positive results in RT-PCR for influenza A/H5N1 virus detec- tion were obtained in 100% of the samples from dead and sick poultry; 93% from the clinically healthy poultry kept together with sick one; positive results ranged from 0 to 36%. Sequencing established the identity of genetic characteristics of strains isolated for wild birds and poultry as well as their affiliation to high pathogenic avian influenza (HPAI). Phylogenetic analysis revealed a high homology of hemagglutining of West-Siberian strains and strains isoolated from bar-headed gooses (Eulabeia indica) on the Qinghai Lake (Western China) in the 2005 spring.
