Kolkhose, named after Petrovskij, which had been attacked by the — 
foot and mouth disease as far back as March, 1966. In the Khar~ 
_kovitz section of the Starosinyav'skij beetroot farm, the mature 
cattle had contracted foot and mouth disease, 17 months after the 
previously infected animals had been clinically cleared of the 
disease. The source of the infection was animal - virus carrier 
of the same Sovkhose. The data collected by us proves that the 
animals which had suffered from foot and mouth disease should not 
be mixed with healthy animals for at least 1.5 to 2 years after 
being clinically cleared of the disease. 
Sometimes the cause of fresh outbreaks of foot and mouth 
@isease, caused by Ao> virus in farms so far unaffected by the 
disease, at the commencement of the foot and mouth epizootic in 
the Ukraine, was the lymph of foot and mouth vaccine, which had 
an excessive residual virulence... Therefore after animals were 
vaccinated in farms which were unaffected by the disease, very 
_ often fresh foot and month outbreaks were observed. 
According to our ( epizootological ) data, the virus carriers 
and virulence which is sometimes active for approx. 17 to 18 
months in animals which had developed foot and mouth disease is 
an ever present danger. 
The study of the epizootological nature of the animal farms 
have shown that foot and mouth epizootic in the Ukraine, caused 
ny ae 
by the Ano virus, ( 1965-1966 ), travelled with lightning speed. 
Later, with every passing year, the force of the epizootic was 
reduced, till finally the epizootic foot and mouth disease was 
observed only as individual outbreaks. A deciding role in putt- 
ing an end to foot and mouth epizootic in the Ukraing was the 
complex of anti-foot and mouth disease protective measure ( such 
a6 quarantine, veterinary, hygienec, etc. ) but, first and 
foremost the method of immunization of animals susceptible to 
foot and mouth infection. 
(6). 
