| In complement-fixation tests with Groups A, B, and California antigens, results were negative with CTF antisera. | Group A, B, California, Bunyamwera (Cache Valley), Quaranfil and Chenuda virus antisera gave negative results when tested by complement-fixation against Colorado tick fever virus antigen. | By CF and NT, CTF is closely related to Eyach virus (see Eyach virus registration). Together, these two viruses comprise the CTF serogroup. | |
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