| | | Modoc Antigen | | Modoc Immune Serum |
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Immune Serum | HI | CF | NT | Antigen | HI | CF | NT |
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| HI, CF, NT: Ho/Ht; NT=LNI in dex. | Powassan | 0/160 | | | Powassan | 40/5120 | | RSSE | 160/5120 | | | RSSE | 320/5120 | 8/256 | SLE | 640/10,240 | | | SLE | 1280/5120 | 64/256 | Ilheus | 320/5120 | | | Ilheus | | 64/256 | Rio Bravo | 320/5120 | 0/16 | <0.5/>2.0 | Rio Bravo | 1280/5120 | 61/256 | <0.5/>6.0 | Bussuquara | 0/320 | | | | | |
| Cross immunity tests: Not related to Powassan. One way cross with Rio Bravo, i.e., Modoc immunized mice resist IC challenge one month later with Rio Bravo virus; Rio Bravo immunized mice do not resist challenge one month later with Modoc virus. No cross immunity with SLE [5] . | By CF and NT, Modoc virus was most closely related to but antigenically distinct from Cowbone Ridge, Jutiapa, San Perlita and Sal Vieja viruses [11] . | |
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