| comparative pathogenicity and serogrouping of three washington isolates of infectious bursal disease virus. | the pathology of three infectious bursal disease virus (ibdv) isolates of washington poultry origin (wa-678, wa-770, and wa-994) and seven other known ibdv strains (sal, d-78, mo, oh, var-a, 2512, and im) was studied in 3-week-old specific-pathogen-free chickens. inoculation with im and 2512 strains resulted in illness and death. no clinical signs or mortality were present with wa-678, wa-770, and wa-994. macroscopically, bursae were swollen and gelatinous with occasional hemorrhages. isolate wa ... | 1993 | 8257354 |