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Parasit Vectors ; 4: 176, 2011 Sep 15.
Article in English | MEDLINE | ID: mdl-21917183

ABSTRACT

BACKGROUND: This research was carried out to develop a reliable monoclonal antibody (MoAb)-based sandwich enzyme linked immunosorbent assay (ELISA) for the diagnosis of active Fasciola gigantica infection in both serum and stool for comparative purposes. METHODS: From a panel of MoAbs raised against F. gigantica excretory/secretory antigens (ES Ags), a pair (12B/11D/3F and 10A/9D/10G) was chosen due to its high reactivity and strict specificity to F. gigantica antigen by indirect ELISA. RESULTS: The two MoAbs were of the IgG1 and IgG(2a) subclasses, respectively. Using SDS-PAGE and EITB, the selected MoAbs recognized 83, 64, 45 and 26 kDa bands of ES Ags. The lower detection limit of ELISA assay was 3 ng/ml. In stool, the sensitivity, specificity and diagnostic efficacy of ELISA was 96%, 98.2 and 97.1%; while in serum they were 94%, 94.6% and 94.3%, respectively. Moreover, a positive correlation was found between ova count in stool of F. gigantica infected patients and the OD readings of ELISA in both stool and serum samples (r = 0.730, p < 0.01 and r = 0.608; p < 0.01, respectively). CONCLUSIONS: These data showed that the use of MoAb-based sandwich ELISA for the detection of F. gigantica coproantigens in stool specimens was superior to serum samples; it provides a highly efficient, non-invasive technique for the diagnosis of active F. gigantica infection.


Subject(s)
Antibodies, Monoclonal , Antigens, Helminth/analysis , Antigens, Helminth/blood , Clinical Laboratory Techniques/methods , Fascioliasis/diagnosis , Animals , Antibodies, Monoclonal/isolation & purification , Enzyme-Linked Immunosorbent Assay/methods , Feces/chemistry , Humans , Immunoglobulin G/isolation & purification , Mice , Mice, Inbred BALB C , Sensitivity and Specificity , Serum/chemistry
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