A large disparity in the seroprevalence results betweenthe two HI tests was demonstrated in the field sera.Overall, significantly (P<0.001) more HI antibodypositiveducks were detected with HI-HRBC than HICRBC,but no sera that were positive in the HI-CRBCwere negative in the HI-HRBC test. This indicates thatthe type of HI test used for assessing field sera has to be
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