[Trial of the intensity and duration of swine fever immunity in pigs].

Comparative testing of the intensity and the continuity of immunity against swine fever was carried out with pigs producers of serum against edema disease and swine erysipelas, vaccinated with an untreated and a freeze-dried K vaccine. Control infection studies revealed that serum-producing pigs with regard to edema disease, immunized with a freeze-dried and an untreated lapinized K vaccine, could acquire sufficiently stable immunity from the 6th to the 9th month following immunization both in the beginning and at the end of the exploitation period. So far as the intensity and the continuity of immunity of pigs producing serum against erysipelas are concerned the animals were shown to acquire sufficiently stable immunity against swine fever when vaccination was carried out with a freeze-dried K vaccine, while not all of the pigs treated with an untreated K vaccine were protected from swine fever upon control challenging. Therefore, instead of immunization with an untreated K vaccine as many as 400 immunization doses of the freeze-dried K vaccine could be used.