Increased anti-Echinococcus granulosus antibody positivity in Fasciola hepatica infection

Background/aims: Parasitic helminths express some antigen, which often accounts for serological cross-reactions. The aim of this study was to determine the prevalence of antiEchinococcus granulosus antibody in patients with Fasciola hepatica infection using indirect immunofluorescence assay. Materials and Methods: The study population consisted of the following groups: Fasciola hepatica group (n=22), hydatid disease group (n=22) and healthy control group (n=24). Indirect immunofluorescence assay for Echinococcus granulosus was performed in all groups. Results: Indirect immunofluorescence assay was positive in all patients with hydatid disease, in 13 of 22 (59%) patients with fascioliasis and in 2 of 24 (8%) healthy subjects. The positivity rate of indirect immunofluorescence assay was significantly higher in the hydatid disease group compared to the fascioliasis group (p<0.001) and compared to the control group (p<0.001), and it was significantly higher in the fascioliasis group compared to the control group (p=0.001). Antibody titer was 1/100 in 7 patients, 1/320 in 12 patients and 1/1000 in 3 patients with hydatid disease. Indirect immunofluorescence assay was positive in 10 of 15 patients with hepatic phase and in 3 of 7 patients with biliary phase of fascioliasis. The antibody titer was 1/100 in 6 and 1/320 in 7 patients with fascioliasis. The antibody titer was 1/100 in both healthy subjects. Conclusions: Indirect immunofluorescence assay for Echinococcus granulosus may be positive in a majority of patients with Fasciola hepatica infection and in some healthy subjects.