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Herpes simplex virus type 2 (HSV-2) is the main cause of herpes genitalis, a recurrent sexually transmitted disease. By the use of routine Serologie methods (complement fixation test, enzyme immunoassay), virus carriers are difficult to identify because of strong antibody cross reactions with antigens of HSV-1 which is ubiquitously spread throughout the population. We introduce a microtechnique Western blot system loaded with HSV-1 and HSV-2 type-specific and common antigens on separated nitrocellulose strips. By the simultaneous evaluation of Immunologie reactions with both strips, the occurrence of HSV-2 specific antibodies can be sensitively detected in serum specimens containing antibodies to HSV-1. A total of 158 serum specimens were analyzed and the results obtained by Western blot were compared to those of a screening ELISA and virus isolation performed with smears of herpes lesions.
An agreement of 97.9 % was assessed between Western blot and virus isolation to detect an HSV-1 and HSV-2 infection. Less specific serologic results were produced by the screening ELISA on HSV-2 antibodies which correlated in 85.4 % (41/48) with virus isolation and typing. Concerning HSV-2 antibody testing, Western blot and ELISA showed an overall agreement in 89.8 % of the sera investigated.
As shown by our data, the HSV type specific Western blot proved to be a specific, reproducible and standardized technique. It can be utilized for both sero-epidemiological surveys and determination of the HSV immune status.