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. 1996 Apr;64(4):1227–1232. doi: 10.1128/iai.64.4.1227-1232.1996

Characterization and immunoprotective properties of a monoclonal antibody against the major oocyst wall protein of Eimeria tenella.

M J Karim 1, S C Basak 1, A J Trees 1
PMCID: PMC173908  PMID: 8606083

Abstract

The oocyst wall of Eimeria spp. consists of a 10-nm-thick outer lipid layer and a 90-mm-thick inner layer of glycoprotein which has been described previously to be composed of a single major protein. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis under reducing conditions and (125)I labelling of a oocyst wall fragments and of delipidated intact oocysts revealed a molecule of approximately 12 kDa as the major protein component of the oocyst wall of Eimeria tenella. An immunoglobulin M monoclonal antibody (c11B9F3) was produced against this 12-kDa oocyst wall protein sliced from a preparative SDS-polyacrylamide gel. Its reactivity by immunofluorescence against oocyst wall fragments and sporozoites or by immunoperoxidase assays of infected tissue sections was stage restricted to gametocytes and oocysts but pan-specific against all face of the oocyst wall. In chicks passively immunized with C11B9F3, oocyst output was significantly (P<0.01) reduced by 42 to 54% after homologous E. tenella infection and by 35% after heterologous Eimeria maxima infection compared with that of control groups. The results demonstrate the presence of a highly conserved, low-molecular-weight antigen on the oocyst wall and the gametocytes of Eimeria spp. which is a candidate for inclusion in a pan-specific, transmission-blocking vaccine against avian coccidiosis.

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Selected References

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