Fowl typhoid live lyophilized vaccine applied at 3-month intervals protected layer chickens from infection and prevented cloacal shedding.

Objective: Here, we developed and tested the efficacy of a vaccination protocol based on a commercially available live attenuated serovar Gallinarum () in layer chickens.

Materials And Methods: 50 layer chickens of 16 weeks age were obtained and divided into two groups ( = 25), control and vaccinated. The vaccinated group received vaccine at 0.

Comparative pathogenicity of infectious bursal disease viruses of three different genotypes.

Infectious bursal disease (IBD) is a highly immunosuppressive and often fatal viral disease of young chickens. The causal agent IBD virus (IBDV) is an avian Birnavirus having two genome segments that have evolved independently and contributed to the emergence of many genotypes with different pathogenic profile. The present study aimed at genetic and pathogenic characterization of IBDVs from Bangladesh.