Eimeria tenella antigen (EtAg)

Eimeria tenella antigen refers to a group of proteins derived from the protozoan parasite Eimeria tenella, which is the primary causative agent of cecal coccidiosis in poultry. These antigens, including microneme proteins (e.g., EtMic2), apical membrane antigens (e.g., EtAMA1), and surface antigens (e.g., EtSAGs), play critical roles in the parasite's life cycle, particularly in host cell recognition, attachment, and penetration of the intestinal epithelium (PubMed: 31253156). In the context of veterinary medicine, these antigens are the primary targets for vaccine development, aimed at eliciting a protective immune response to reduce the morbidity and mortality associated with coccidiosis (PubMed: 28606140). While traditional vaccines utilize live or attenuated oocysts, modern recombinant vaccines focus on specific purified or expressed antigens to provide targeted immunity without the risk of disease transmission. The efficacy of these antigens as therapeutic targets is typically measured by a reduction in oocyst shedding and the severity of intestinal lesions in infected birds (PubMed: 30143115).

Other names

Coccidial antigenEimeria tenella surface proteinEtMic2EtAMA1EtSAGMicroneme proteinRhoptry protein

Antigens from Eimeria tenella are used in vaccines to stimulate the host's immune system, inducing both humoral (antibody production) and cell-mediated immunity (T-cell activation) to prevent parasite attachment and invasion of intestinal epithelial cells.