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Cross-reactive response to other Leptospira strains. [3H]-Thymidine incorporation measurement of proliferation when stimulated with different Leptospira strains, serovars, and species. PBMCs collected from vaccinated and control cattle 32 weeks postvaccination. Stimulation index (SI) of pokeweed mitogen (PWM; positive-control mitogen) values between 50 and 300 (not shown). Mean (n = 6) + SEM; an asterisk (*) indicates that a group is significantly different (P < 0.05) from other groups.
