[Anomalous response of antibodies in rash-causing viral infections].

20 pairs of sera from the National System of Seroepidemiological Surveillance of the triple viral vaccine received in the laboratory with febrile rash diagnosis were studied. By using the hemagglutination inhibition test, it was observed an abnormal answer of antibodies to both rubella and measles through a falling of the antibody titre in one or both diseases, or in one of them with seroconversion to the other one. With the aim of defining the existence of a possible polyclonal activation already described in literature, it was decided to study the antibody response to family Herpesviridae (HSV, EBV, CMV, VZV). 80% of answer to these viruses were found. The results are submitted and discussed.