Article Text

Immunosuppressive effect of a naturally acquired subclinical bursal agent infection on vaccination against Newcastle disease
  1. K Almassy and
  2. T Kakuk

Abstract

A naturally acquired subclinical infection of infectious bursal agent was shown to be the probable causative factor of marked immunosuppression of Newcastle disease vaccine in young chicks. Old hens maintained in the same contaminated environment did not exhibit immunosuppression.

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