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Measurement of survival rates after challenge with amounts corresponding to 2 LD50 of Ts crude venom pre-incubated with 200 µL of serum from each individual animal. Sheep number 5, 6, 7 and 8 were immunized with Ts crude venom (G2) and sheep number 9, 10, 11 and 2 were immunized with glutaraldehyde-detoxified Ts venom (G3).
