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The aim of the studies was the use of Haemophilus somnus vaccine in the immunization of chickens to protect them against Salmonella infections by increasing the local cross-immunity of the alimentary tract. Broilers were immunized with a live vaccine administered in drinking water on the 1st and the 14,h day of life. The groups were as follows: H. somnus (24h broth culture, 109 cfu/ml); Salmonella...
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