IgM and avidity of IgG antibodies in primary HHV-6 infections.

Primary HHV-6 infection could be diagnosed by enzyme immunoassay from a single serum using IgG avidity test based on results obtained from 43 patients, 26 with seroconversion and 17 with variable antibody levels. The avidity was less than 30% in all patients with seroconversion. HHV-6 IgM appeared non-specific.

Varicella zoster and Borrelia burgdorferi are the main agents associated with facial paresis, especially in children.

Background: The etiology of facial paresis (FP) often remains unresolved. Yet, a microbial association is frequently suspected.

Objective: To evaluate the infectious etiology of FP by using sensitive tests.