B. Newcastle Disease Virus (ND)

The results of 37 groups (463 assays) are shown in Figure 3.24. Once again the regression is based only on the HI data in birds older than 20 weeks. The results of the two groups tested with the Elisa, which both had the same mean titre group, have been added to the graph. Once again the mean Elisa titre tended to be higher than the HI GMT.