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Opsonophagocytic activity of affinity-purified anti-HMW strain 12 or anti-HMW strain 15 antibodies pre- and postadsorption with nontypeable H. influenzae strain 12 or nontypeable H. influenzae strain 12-4, the isogenic mutant deficient in expression of HMW proteins. Each antibody preparation was assayed against strain 12.
