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Detection of a Circulating Antigen in Human Schistosomiasis Japonica Using a Monoclonal Antibody
Chi Fu
Chi Fu
Vanderbilt University, Hua Shan Hospital, First Shanghai Medical University, Nashville, Tennessee, People's Republic of China
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Clint E. Carter
Clint E. Carter
Vanderbilt University, Hua Shan Hospital, First Shanghai Medical University, Nashville, Tennessee, People's Republic of China
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A double antibody enzyme-linked immunosorbent assay (sandwich ELISA) was used for the detection of a circulating antigen from human schistosomiasis japonica infections. This assay involves the use of polyclonal rabbit Schistosoma japonicum soluble egg antigen (SEA) antiserum to bind circulating antigen and a monoclonal antibody (Mab-H4) to identify and quantify this antigen. Sera from 108 S. japonicum-infected patients (acute and chronic) were tested. Sera from 93 of 95 patients with chronic infection were positive for this antigen; sera from 12 of 13 patients with acute infections were also positive. Antigen was not detectable in control human sera. Sera from 35 chronic schistosomiasis patients were collected 6–12 months after praziquantel treatment. Circulating antigen was not detectable in the sera of 33 of these patients and was dramatically reduced in 2. This ELISA system may prove valuable in differentiating past and current infections.
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