About ecological and epizootological zonation of the south Central Siberia according to influenza A virus

The goal of research was to study the positive samples distribution to influenza virus subtype A in wild and synanthropic birds according to districts of Krasnoyarsk region with the zonation of high-risk infection of human and farm animals. The selection of biological material from165 bird species in 2006-2014 in 5 districts was made. In 2006-2010 anti-bodies to the hemagglutinin subtype H5 were de-tected in 420 samples in 19 districts, RNA of avian influenza subtypes H5 and H7 - in 13 districts of Krasnoyarsk region. In 2011-2012, and especially in 2013-2014 the selection of samples was carried out in a much smaller amount, but these data were generally consistent with previously adopted by zonation of epizootic danger. The largest number of samples (+) were isolated from birds in 9 districts (80 % were in MRIA and 87.4 % were PCR). The high association between the percentage of im-mune and infected birds (rs = 0.77 at P> 0.05) is marked in 6 districts. It is assumed that the in-crease of immune birds' abundance is a conse-quence of the herd immunity effect, due to the co-lonial settlements of gulls, rooks and regular flocks of crows in their feeding ground. Research of faunal composition showed relatively high contingence (rs = 0.79 P