primary human herpesvirus-6 and -7 infections, often coinciding, misdiagnosed as measles in children from a tropical region of brazil.we investigated primary human herpesvirus-6 and -7 (hhv-6, hhv-7) infections as a cause of rashes incorrectly diagnosed as measles in brazilian children. sera from 124 patients, aged 4 months to 17 years, from the states of rio de janeiro and espirito santo, in whom measles, rubella and parvovirus b19 infections had been excluded, were studied using indirect immunofluorescence antibody avidity tests; 38 (31%) had evidence of primary hhv-6 and/or hhv-7 infections. twenty four children had primary ...200314596528
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