Persistence of protection through 33 months of age provided by immunization in infancy with two three-component acellular pertussis vaccines. Stage II Working Group.
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S. Salmaso | M. L. Ciofi Degli Atti | A. Tozzi | P. Mastrantonio | D. Greco | S. Wassilak | M. Giuliano | A. Anemona | A. Giammanco | M. C. D. Atti | Steven G. F. Wassilak