title: Correlation of haemagglutination inhibition and enzyme-linked immunosorbent assays for antibodies to Newcastle disease virus.
abstract: Antibody responses of commercial broiler chickens vaccinated for Newcastle disease were assayed by haemagglutination inhibition and enzyme-linked immunosorbent assay, and the results from the two methods compared. Three-hundred-and-nineteen chickens from 37 farms were assayed. The correlation coefficient was 0.85. Analysis of individual slopes of data from the 37 farms indicated that at least eight chickens from a farm must be sampled to achieve an acceptable degree of parallelism.
authors.affiliation: Poultry Centre, University of Zagreb, Zagreb, Republic of Croatia.
authors.forename: V
authors.initials: V
authors.lastname: Cvelic-Cabrilo
authors.forename: H
authors.initials: H
authors.lastname: Mazija
authors.forename: Z
authors.initials: Z
authors.lastname: Bidin
authors.forename: W L
authors.initials: WL
authors.lastname: Ragland