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  • Title: [How often can the clinical diagnosis of exanthema subitum be confirmed with the HHV-6 serology test].
    Author: Rudin C, Hirsch HH.
    Journal: Klin Padiatr; 1991; 203(2):109-12. PubMed ID: 1851907.
    Abstract:
    Three years ago a newly recognized human herpes virus (HHV-6) was identified to be the causative agent for exanthem subitum (roseola infantum). So far this diagnosis was suggested chiefly by excluding other infections and the presence of a typical course of the disease. To find out how often the clinical diagnosis can be confirmed serologically, we asked five pediatricians in private practice as well as residents of the out-patient and infant departments of our hospital to obtain paired heparinized blood samples of any child suspicious for exanthem subitum. 36 children with clinically suspected exanthem subitum and a mean age of 14.2 (5-71) months were included in this prospective study. Indirect immunofluorescence was used to detect IgG and IgM antibodies to HHV-6. In 22 children (61%) the clinical diagnosis was confirmed serologically. IgM antibody was found in only 16 of these 22 children. In 8 patients the results were ambiguous. Three had in the same time a doubtful seroconversion to other viruses of the herpes group (HSV twice; EBV once), in four children there was an insufficient rise in IgG antibodies without presence of an IgM response, and once we found a very high HHV-6 specific antibody titre (greater than 1:80) in both serum samples. In 6 children neither a seroconversion nor a rise in HHV-6 antibody titre were found. Retrospectively, only three of these children had a clinical course really typical for exanthem subitum. We conclude that in most cases the clinical diagnosis of exanthem subitum will be confirmed by serological examination.(ABSTRACT TRUNCATED AT 250 WORDS)
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