undifferentiated type fevers

un·dif·fer·en·ti·at·ed type fe·vers

a term applied to illnesses resulting from infection by any virus, that was formerly in the Arbovirus group, pathogenic for humans, in which the only constant manifestation is fever; rash, lymphadenopathy, or arthralgia (alone or in combination) may occur in some people but not in others; some viruses may induce infections in which undifferentiated type fever is the only manifestation, whereas other viruses may induce in some people only undifferentiated fever, and in others similar fever followed by secondary manifestations, for example, a hemorrhagic fever or encephalitis.

un·dif·fer·en·ti·at·ed type fe·vers

(ŭn'di-fĕr-en'shē-ā'ted tīp fē'vĕrz)
A term applied to illnesses resulting from infection by any one of the arboviruses pathogenic for humans, in which the only constant manifestation is fever; rash, lymphadenopathy, or arthralgia (alone or in combination) may occur in some affected people 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 people only undifferentiated fever, and in other persons similar fever followed by secondary manifestations, e.g., a hemorrhagic fever or encephalitis.