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  • Title: Sequential immunization of laboratory personnel with influenza A/New Jersey/76 split- and whole-virus vaccines.
    Author: Edelman R, Scheidt KB.
    Journal: J Infect Dis; 1977 Dec; 136 Suppl():S500-6. PubMed ID: 606772.
    Abstract:
    One hundred thirty-three healthy, at-risk Fort Detrick laboratory workers were inoculated with 400 chick cell-agglutinating (CCA) units of influenza A/New Jersey/76 split-virus vaccine (Wyeth Laboratories, Philadelphia, Pa.). Systemic and local reactions were infrequent, mild, and comparable to those of a sham-vaccinated group of volunteers. Only 28% of subjects 19-24 years old developed titers of hemagglutination-inhibiting (HAI) antibody of greater than or equal to 1:20, whereas titers of 91%-100% of subjects 25-62 years old reached this level. Thirty-one vaccinated subjects with no or low titers of antibody were given a booster dose (400 CCA units) of Wyeth vaccine six weeks after the first inoculation. Only 58%-67% of these vaccinees achieved HAI titers of greater than or equal to 1:20 after the booster. Fourteen persons required a second booster dose for protection; after vaccination with 400 CCA units of whole-virus vaccine from Merck Sharp and Dohme (West Point, Pa.), 89%-100% of the 14 vaccinees finally achieved HAI titers of greater than or equal to 1:20. The split-virus vaccine was safe, but it was poorly antigenic as a primary vaccine in persons 19-24 years old and as a booster in persons of all ages who have poor antibody responses in general.
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