Previous research on expression of CPs from Paragonimus westermani determined that three CPs (CP4, CP7, and CP8) where consistently expressed through the developmental stages of the parasite, from metacercaria to adult, while these recombinant antigens also showed the highest reactivity against serum samples from P. mexicanus and very low reactivity against other helminthic infections and normal controls.15 The gene discussed is CAD; the disease is helminthiasis.