VACCINE AGAINST PORCINE REPRODUCTIVE AND RESPIRATORY SYNDROME (PRRS), METHOD OF IMMUNIZATION OF PIG AGAINST PRRS, METHOD OF VACCINE PREPARING, ISOLATED AND PURIFIED STRAIN OF PORCINE REPRODUCTIVE AND RESPIRATORY SYNDROME VIRUS Russian patent published in 2002 - IPC

FIELD: veterinary science, virology. SUBSTANCE: invention relates to method of preparing living vaccine, method of immunization of pigs against porcine reproductive and respiratory syndrome (PRRS) and, essentially, to isolated and purified virus strain ATCC VR 2509. Vaccine is administrated in sows, gilts and piglets for their immunization against PRRS. Vaccine comprises living strain of virus VR 2509 that is avirulent and induces effective immunity. Vaccine has to contain about from 10⁴ to 10⁸ plaque-forming virus units that ensures to obtain optimal result in animals immunization. EFFECT: improved method of vaccine preparing, enhanced effectiveness, valuable curative properties. 14 cl, 3 dwg, 4 tbl, 3 ex