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  • Title: Live attenuated varicella vaccine: the KMcC strain in healthy children.
    Author: Arbeter AM, Starr SE, Weibel RE, Neff BJ, Plotkin SA.
    Journal: Pediatrics; 1983 Mar; 71(3):307-12. PubMed ID: 6298698.
    Abstract:
    The KMcC strain of live, attenuated varicella-zoster virus vaccine was studied in healthy children as a preliminary step toward varicella vaccine studies with this strain in children with leukemia. Forty-three children were immunized: 26 with the 40th passage vaccine and 17 with the 50th passage. Studies included surveillance for clinical reactivity, oropharyngeal excretion of vaccine virus, viruria, and viremia. Antibody responses were assayed by fluorescent antibody to membrane antigens and immune adherence hemagglutination. Cell-mediated immune responses were assayed by lymphocyte proliferation to varicella-zoster virus specific antigens. There was 100% seroconversion to the KMcC passage 40 and 50 vaccines (by fluorescent antibody to membrane antigen assay). Every child studied developed in vitro lymphocyte proliferation to varicella-zoster virus antigens. Papular skin lesions, probably vaccine related, occurred in 31% of the 40th passage vaccinees but in only 6% of the 50th passage vaccinees. The 50th passage KMcC strain vaccine is sufficiently immunogenic and safe to initiate clinical studies with leukemia patients.
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