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    Bull World Health Organ. 1975;52(3):307-11.

    The minimum protective level of antibodies in smallpox.

    Abstract

    Blood samples from 57 contacts of 6 smallpox cases were tested for haemagglutination-inhibiting (HI) and neutralizing antibodies. All 6 contacts who subsequently developed smallpox were unvaccinated and had neutralizing antibody titres of 10 or less. However, 6 unvaccinated contacts with similar antibody levels did not develop smallpox. None of the 41 vaccinated contacts, regardless of their antibody level, contracted the disease.

    PMID:
    1084801
    [PubMed - indexed for MEDLINE]
    PMCID: PMC2366379
    Free PMC Article

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