Comparative study of the formation of the immune response caused by vaccines against avian influenza (H9) of chins, including different strains

A comparative study of the formation of the immune response induced by vaccines against avian influenza (H9) in chickens, including strains A/chicken/UAE/415/99 subline G1-like and A/chicken/Amursky/03/12/H9N2 subline Y280-like, is presented. It has been established that the use of the vaccine against avian influenza (H9N2), including the A/chicken/UAE/415/99 strain of the G1-like subline, makes it possible to ensure 100 % formation of the immune response. Compared to the vaccine against avian influenza (H9N2), which includes the A/chicken/Amursky/03/12/H9N2 strain of the Y280-like subline, its use can increase the intensity of immunity by an average of 45.2 % and the uniformity of antibody titers by 24.8 %. Immunization of poultry against avian influenza with the vaccine against avian influenza (H9N2), including the A/chicken/UAE/415/99 strain of the G1-like subline for every 100,000 heads, due to an increase in the survival rate of birds and a higher level of hatching of chickens, allows to obtain a positive economic effect at the level 5010446.38 rubles, the economic efficiency of veterinary measures is 8.08 rubles. for one ruble of expenses.