Rapid diagnosis of varicella-zoster virus infection by direct immunofluorescence.

Laboratory results were reviewed for 47 patients who had skin lesions that had been simultaneously examined by viral culture and direct immunofluorescence for the presence of varicella-zoster virus. Immunofluorescence established the diagnosis in 24 of 28 patients (86%) strongly suspected on clinical grounds of having varicella-zoster infection. Viral culture was positive in only 10 of 28 patients (36%). Skin lesions in 19 patients who had other diagnoses were negative by both tests. Direct immunofluorescence appears to be a highly sensitive and specific technic for the rapid diagnosis of cutaneous varicella-zoster virus infections.