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Parasite-Specific IgE and IgG Levels in the Serum and Pleural Effusion of Paragonimiasis Westermani Patients

In seven patients with paragonimiasis westermani, parasite-specific IgE and IgG levels in sera and pleural effusion were determined by an enzyme-linked immunosorbent assay (ELISA). The sensitivity to adult excretory-secretory (E-S) antigen was compared with the sensitivity to whole worm extract antigen, and the former was more sensitive in both an IgE-ELISA and IgG-ELISA. Both parasite-specific IgE and IgG could be detected by ELISA at levels much higher than those in control subjects using E-S antigen. When specific IgE and IgG levels in sera and pleural effusion of individual patients were compared, the latter had higher values. The difference between levels of specific IgE in pleural effusion and serum did not correlate with that of specific IgG. These results indicate that specific IgE and IgG antibodies form locally, i.e., in the lung, and that pleural effusions from patients with paragonimiasis are more suitable than serum for immunodiagnosis.