During avian influenza virus surveillance (AIV) carried out in September 2019 in the Lake Baikal basin (Northeast Asia, Russia), one cloacal swab was taken from each of 144 wild birds. The incidence of avian infections caused by viruses of the I Orthomyxoviridae i and I Paramyxoviridae i families appears to be seasonal, with the highest isolation rate being in juvenile birds in the fall of the year (Dorzhiev et al., [3]). Due to its physiographic characteristics, Northeast Asia plays a key role in the abundance, distribution, and migration ecology of wild bird species (Sharshov et al., [19]).