RESUMO
Transmissible gastroenteritis of swine (TGE) was studied in detail for three years; over-all survey on epizootologic and commercial properties of this disease was thus obtained. Occurrence of TGE, its seasonal character, indices of morbidity, mortality and lethality were evaluated statistically. The morbidity rate dropped in 1973 from 68% to 41% in comparison with the year 1972, as well as the mortality rate decreased -- from 23% to 6% and as to the lethality rate -- from 34% to 14%. In the year 1972 (1973) 437.50 (275.21) animals were infected on an average per one focus of the disease, 146.88 (37.71) animals died among infected pigs and 13.84 (5.86) pigs were compulsorily slaughtered. Commercial losses amounted to 82 482 Kc per one vaccinated focus in 1972, and to 60 213 Kc per one non-vaccinated focus (irrespective of the costs of vaccination -- 70 755 Kc). In 1973 commercial losses were 7650 Kc on an average in vaccinated focuses, 41 000 Kc in non-vaccinated focuses (regardless of the costs of vaccination -- 14 797 Kc). Commercial effectiveness reflects in fewer natural focuses of the disease and in lower morbidity; the savings are 4.30 Kc per 1 Kc of investment costs.