| | | Hyperimmune mouse serum to HAZ virus (homologous titer = 320) did not react in the HI test with 27 arbovirus antigens including 8 members of group A, 13 of group B, 4 of group C, and 2 others. HAZ hyperimmune mouse serum (homologous titer = 128) did not react in the CF test with antigens of 81 arboviruses, and of hepatoencephalitis virus and normal mouse brain [1] . | | HAZ virus found to be related to, but distinct from the Congo virus by NT and CF tests [2] , [3] , [5] , also by HI [4] . | | A low-titered relationship by CF, IFA and indirect HA was demonstrated between CHF-CON and NSD viruses [6] , [7] . SIRACA has decided that these relations are no greater than those used to establish BUN Supergroup. The CHF-CON and NSD antigenic groups should be kept as two distinct serogroups. | | Following the above observations, intergroup relationships were demonstrated for members of the above two serogroups as well as for members of the DGK, HUG, QYB and SAK serogroups [8] . | | |
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