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Kolkhose, named after Petrovskij, which had been attacked by the foot and mouth disease as far back as March, 1966. In the Kharkovitz 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 disease, caused by A22 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 by the A22 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 putting an end to foot and mouth epizootic in the Ukraine was the complex of anti-foot and mouth disease protective measure ( such as quarantine, veterinary, hygienec, etc. ) but, first and foremost the method of immunization of animals susceptible to foot and mouth infection.
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