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SummaryThe isolation and laboratory studies of an unidentified virus isolated from a howler monkey in Trinidad, W. I., have been described. The virus has been named "Manzanilla virus" after the region from which it was obtained. The absence of virus-neutralizing antibodies from the sera of a number of forest workers would seem to indicate that this virus probably is not a frequent cause of infection in man.
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Anderson et al. (1960) studied this question.
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