Absorption analysis of boLA sera.

BoLA specificities w1 w2 w5 w8 w9 w10 and w11 have been re-examined by absorption. All of the clusters except w9 showed evidence of sub-group specificities, but only in some cases (w1, w5, w8 and w11) is it suggested that the definition should be revised. The results show a very high degree of reproducibility between sera from different laboratories with clusters of narrow and wide sera for most specificities. These behave in all the cases reported here as linear sub groups or inclusion groups.