Key result
Rep-ELISA and ΔCap-ELISA correlate with PCR for Duck circovirus, while Rep-ELISA differentiates natural from vaccine immunity.
Why the study?
Most indirect ELISA assays targeting the Duck circovirus Cap protein cannot differentiate between antibodies induced by natural infection versus vaccination.
The established Rep-ELISA and ΔCap-ELISA methods provide a highly specific and sensitive tool for Duck circovirus detection that can successfully differentiate between natural infection and vaccine immunization.
Rep-based ELISA may differentiate DuCV natural infection from vaccination; leaves open field validation before routine diagnostic adoption.
Duck circovirus (DuCV) is an immunosuppressive virus that primarily causes growth retardation and immunosuppression in infected ducks, often leading to secondary infections, thereby posing a serious threat to the global duck industry. Currently, most indirect ELISA assays for DuCV rely on antibodies targeting the Cap structural protein; however, these methods cannot distinguish between antibodies generated by natural infection and those induced by vaccination. In this study, the Rep non-structural protein and truncated Cap structural protein lacking the nuclear localization signal (ΔCap) were successfully expressed using a prokaryotic Escherichia coli expression system. Two indirect ELISA methods were developed using the two proteins as coating antigens, and the method conditions were further optimized. The results demonstrated that both the Rep-ELISA and ΔCap-ELISA exhibited high specificity and sensitivity. When applied to duck serum samples from parts of Shandong Province, the correlation rates between the ELISA and conventional PCR methods were 95.5% and 93.3%, respectively. Furthermore, the positive detection rates in sera from vaccinated ducks were 10% for Rep-ELISA and 91% for ΔCap-ELISA, indicating that the ELISA method established in this study can differentiate between natural infection and vaccine immunization. This study provides a novel serological tool for epidemiological surveillance and vaccine evaluation of DuCV.
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Wu et al. (2025) studied Duck circovirus (DuCV) infection (n=292). Rep-ELISA and ΔCap-ELISA vs. Conventional PCR was evaluated on Correlation rate with conventional PCR. The newly developed Rep-ELISA and ΔCap-ELISA demonstrated high correlation rates with conventional PCR for detecting Duck circovirus, with Rep-ELISA successfully differentiating between natural infection and vaccine-induced immunity.
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