viruses,“classic 2.2. 1.2” and “variant 2.2. 1.1” strains, have evolved. The underlying host
immune responses counteracting these viruses in chickens remain not well understood. In
the present study, the cytokine responses to a classic strain (C121) and those to a variant
strain (V1063) were compared in naïve and vaccinated chickens. In naïve chickens, the
C121 replicated more efficiently than the V1063. Both the C121 and the V1063 increased …