Pasteur Merieux Connaught Tripedia
Executive Summary
Recall of one lot of diphtheria, tetanus and acellular pertussis vaccine Jan. 27 is based on reduced potency of the diphtheria component, a Jan. 28 FDA "Dear Doctor" letter states. "Although this product met all specifications at the time of release, the potency of the diphtheria component fell below specification prior to the product's expiration date [June 8, 1999]." The company has not determined the cause of the reduced potency