village, Zarechnoe region, Rovno Oblast. Strain 1158 was isolated on 6/6/74 
from the brain of a carrion crow trapped on 16/6/74 near Privetovka village, 
Zarechnoe region, Rovno Oblast, 
According to biological properties (tests in animals, chicken embryos, 
and chicken embryo fibroblast tissue culture), ali strains proved to be similar. 
The incubation period in NWM infected by different methods was 4-6 (avg.) 
days and decreased to 3-5 days following passages, The cCisease in all 
| suckling mice was manifested as asthenia, disorders in coordination of 
movements, spasms, and death. In 3-4 week oid mice, the virus caused 
disease in about 50% cf infected animals and showed only slight pathogenicity 
for adult white mice, guinea pics, and white rats. Ali strains develoned 
well in 6 day old chicken embryos and caused death of most of them; the 
strains had a slight effect on chicken embryo tissue culture. 
wee 
| From results of serological identification by the CF test with polytype 
; and mohotype aie ue ascitic finids) to arboviruses (IAF were obtained 
from D. I. Ivanovsky Virological Institute, USSR Academy of Medical 
Sciences), 4 ae cS) (31 78, 586, $36, and 974} were referred to Uukuniemi 
virus and 2 strains (962 and 1158) were identified as Batai virus of the 
Bunyamwera sercgroup, 
Isolation of Uukuniemi virus from migratory and wandering birds expands 
the circle of its ecological associations and shows the irnportant role of 
birds in distritution of this virus. I the aveilabie literature, there are no 
publications cn isolation of Bunvamwera group viruses from birds. Isolation 
of Batai virus from resident ctirds feeding in foci where this virus was 
isolated for 3 years previously from raosquitoes aliowed us to assume that 
birds are-important_in maintaining naturel foci -cf this. arbovirus in western 
Ukraine. 
