sheep was 46.6% during the whole of the period of the foot and 
mouth epizootic ef 1965-1966. 
Sueh rapid propogation of the foot and mouth infection is 
explained, apparently, not only by the properties of the foot 
and mouth As> virus, which appeared in our country for the first 
time, but also by the high susceptibility of animals, te this 
virus. The total increase in the overall number of the large 
cattle and pigs during the period from 1952 to 1965 being 1.8 
to 2 fold in the Ukrainian S552, the overall animals which were in- 
fected by the foot and mouth disease per one area affected by 
the 1965 - 1966 epizootic, at an average, increased by 9 to 10 
times as compared with the previous epizootic. 
The propagation of the foot and mouth epizootic, during the 
autumn-winter pericds, was observed to be much less among the 
privately owned animals, 
During the highest peak ef the epizootic almost all the large 
cattle in the affected kolkhozes and Sovkhoses went down with the 
foct and mouth infection. 
The percentage of affected anirals was many times higher in 
the arees of the Republic where the foot and mouth epizootic, 
caused by the A.. virus, was observed in October-December, 1965, 
22 
than in the areas where the epizootic appeared in 1966. 
a The reason for a smaller overall morbidity of the feot and 
Mouth disease in these areas is the highly effective anti-foot 
5 
