Chickens susceptible to infectious bursal disease (IBD) became viremic for only a transient period when inoculated with two different strains of infectious bursal disease virus (IBDV). The virus was not isolated from tissues beyond 10 days postinoculation. There was no apparent spread of IBDV to susceptible contact chickens placed with infected groups 16, 30, 42, and 52 days postinoculation. At...

165 Use of CVI988 in optimizing revaccination protocols against Marek's disease. 166 Alteration of a single amino acid in the basic domain of Marek's disease virus Meq oncoprotein plays an important role in T-cell transformation. 167 Correlation between Marek's disease virus replication rates and pathotype based on fifteen virus strains. J. Dunn*, USDA-ARS-ADOL. 168 Attenuation of Marek's disea...

The distribution of the immune complex vaccine virus for infectious bursal disease (IBD) in tissue was examined and the viral loads of the organs were quantitatively compared. One-day-old specific pathogen free (SPF) and maternally immune broiler chickens were injected subcutaneously with the vaccine. Lymphoid and non-lymphoid tissues were collected at various time intervals during the experime...

Nucleotide sequences of the VP2 hypervariable region (VP2-HVR) of 10 infectious bursal disease viruses detected in indigenous and exotic chickens in Zambia from 2004 to 2005 were determined. Phylogenetic analysis showed that the viruses diverged into two genotypes and belonged to the African very virulent types (VV1 and VV2). In the phylogenetic tree, strains in one genotype clustered in a dist...