Patients seen after treatment.

aIdentified by microscopy during earlier active disease episode (recorded data).bMicroscopic findings in colon or bladder biopsy upon re-visit. DE = degenerated eggs; EO = eosinophilic infiltrates; Negative = normal histology.cYears post exposure = time (years) between last exposure in endemic country and PCR testing.dNumber of earlier treatment courses since last exposure.eTime post treatment = time (wk = weeks; y = years) between completion of last treatment course and PCR testing.fNote that 10 mL plasma were processed. 1 copy per PCR mL = 1.67 copies per PCR vial.