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Survival of ICR mice passively immunized i.p. with 0.5 ml rabbit antisera against hexavalent (serum # 2 in Table 1), hexavalent-J14 (serum #6 in Table 1) or J14-KLH (J14 titer=25,600) and then challenged i.p. 24 hours later with 8.8 × 105 of type 6 GAS.