Abstract
THE first suggestion that viruses may have a role in human leukemogenesis came from studies in the electron microscope in 1957, when Dmochowski et al.1 observed particles resembling the virus of murine leukemia (type C particles) in human leukemic lymph nodes. At present, ten years later, evidence for the viral etiology of leukemia in man continues to rest primarily on electron microscopy. Repeated attempts to grow viruses from leukemic tissue have been largely unsuccessful, and thus far it has proved impossible to transmit human leukemia to animals by means of cell-free extracts.Likewise, from an epidemiologic point of view very . . .

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