Determination of minimum hemagglutinin units in an inactivated Newcastle disease virus vaccine for clinical protection of chickens from exotic Newcastle disease virus challenge.


The potency of inactivated Newcastle disease virus (NDV) vaccines in the United States is currently determined using vaccination and challenge of experimental animals against a velogenic strain of NDV. Because velogenic strains of NDV are now classified as select agents in the United States, all vaccine potency testing must be performed in live animals… (More)


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