[Aerosol immunization of ducks with Spirovak erysipelas vaccine "Dessau"]

A method for active immunisation of ducklings during the raising period (between the first and 20th days of age) was devised in another attempt to control erysipelas septicaemia of duck on freeland fattening sites. Spirovak erysipelas vaccine "Dessau" was aerogenically applied through vortex injector nozzles, when the animals were between five and 20 days of age. Immunisation took place in groups of 5,000 animals each. The vaccine concentrations were four doses per cubic metre in the first immunisation and eight doses per cubic metre in the second. Exposures were 30 minutes in the first immunisation and 20 minutes in the second. Ten man-hours were required to immunise 10,000 ducks. Benefits of the method are substantive improvement of working conditions, higher labour productivity, and lower production cost.