Browsing by Author "Black, Francis L."

Now showing 1 - 5 of 5
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    Epidemiology of infectious disease: the example of measles
    Black, Francis L.; Pinheiro, Francisco P.; Hierholzer, Walter J.; Lee, Richard V.
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    Influenza in an isolated population in the Amazon
    (Elsevier, 1974) Napiorkowski, Patricia A.; Black, Francis L.
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    A novel pattern of treponemal antibody distribution in isolated South American Indian populations
    (The Johns Hopkins University. School of Hygiene and Public Health, 1978) Lee, Richard V.; Black, Francis L.; Hierholzer, Walter J.; West, Bernice
    Inquéritos sorológicos para a doença treponêmica foram realizados em 1970-1976 entre três grupos populacionais isolados e linguisticamente distintos na região amazônica brasileira e entre os índios mapuches do sul do Chile. Três padrões foram encontrados: 1) nenhuma evidência de infecção treponêmica em dois grupos contatados muito recentemente; 2) Indivíduos positivos esporádicos Em grupos com longos períodos de contato com populações não indígenas; e 3) alta prevalência de testes positivos em um grupo cultural com exposição limitada a não índios. A soroepidemiologia e as manifestações clínicas de uma possível infecção treponêmica Nas aldeias com alta prevalência de testes positivos foram diferentes das treponematoses humanas classicamente descritas
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    Restriction and persistence of polymorphisms of HLA and other blood genetic traits in the Parakanã Indians of Brazil
    (Wiley, 1980) Black, Francis L.; Salzano, Francisco M.; Layrisse, Zulay; Franco, M. Helena L. P.; Harris, Nancy S.; Weimer, Tania A.
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    Tracing prehistoric migrations by the viruses they carry: human T-cell lymphotropic viruses as markers of ethnic relationships
    (Wayne State University Press, 1997) Black, Francis L.
    Three reasons that HTLV-I and HTLV-II would not be expected to trace human migrations over extended time periods have been examined, and none has proven fatal to the theory. Transmission of the HTLVs (human T-cell lymphotropic viruses) in endemic settings highly depends on passage through breast milk, and this creates a pattern of distribution similar to that of mitochondrial DNA. The HTLVs probably evolve at variable rates, making the extent of sequence change a poor tool for dating human migrations. However, qualitative relationships between the sequence of human population separations and virus strain may be more regular. The uniqueness of viruses as markers of human relationship gives this method special value as a source of novel ideas regarding human movements and as independent confirmation of migration hypotheses that have been based on more conventional methods.