Abstract
NEWCASTLE disease has constituted a serious menace to the poultry industry of the United States for more than a decade. While live-virus vaccines provide a substantial measure of protection against the ailment, they have failed in some respects to measure up to the standards of a perfect immunizing agent. The incidence of Newcastle disease has not decreased in some sections of the land where vaccines have been widely used. In addition, some vaccines fail to provide uniform and lasting immunity. In other instances, complicating respiratory disease has been troublesome in flocks for a time after the application of some vaccines. In view of these facts, studies designed to investigate the possibility of employing other methods of immunization are warranted.In this country, little attention has been given to the possible use of immune serum in combating the ravages of Newcastle disease on the poultry industry. In foreign lands, several investigations …
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