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Undifferentiated type fever

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undifferentiated type fever

A term applied to illnesses resulting from infection by any one of the arboviruses pathogenic for man, in which the only constant manifestation is fever; rash, lymphadenopathy, or arthralgia (alone or in combination) may occur in some individuals but not in others; some arboviruses may induce infections in which undifferentiated type fever is the only manifestation, whereas other arboviruses may induce in some persons only undifferentiated fever, and in other persons similar fever followed by secondary manifestations, e.g., a haemorrhagic fever or encephalitis.