Infectious coryza: cross-protection studies, using seven strains of Haemophilus gallinarum
Rimler, R.B.; Davis, R.B.; Page, R.K.
American Journal of Veterinary Research 38(10): 1587-1589
1977
ISSN/ISBN: 0002-9645 PMID: 931140 Document Number: 41
Bacterins prepared from 7 strains of Haemophilus gallinarum were used to immunize chickens for cross-protection studies. Three distinct immunotypes were distinguished. Slight protection between immunotypes was evident for some strains. Airsacculitis could be prevented by use of these bacterins; however, prevention was related to immunotype specificity. Hyaluronic acid found in 2 strains rendered them inagglutinable in homologous antiserums. Treatment with hyaluronidase rendered them agglutinable.
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