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The results of serological examinations of chickens after their experimental immunization with inactivated Campylobacter jejuni vaccine given subcutaneously (two groups aged from 10-18 days and 21-28 days) or infected orally on day 3 or broilers and laying hens infected under field conditions have been presented. The level of specific antibodies in sera of immunized chickens (OD ELISA mean values...
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