Figure 3From: A direct real-time polymerase chain reaction assay for rapid high-throughput detection of highly pathogenic North American porcine reproductive and respiratory syndrome virus in China without RNA purificationRepeatability and reproducibility of the dRT-PCR assay. Three field serum samples with different virus titers were selected and assayed. Mean values and standard deviations of Ct values are depicted above and beside the box plots, respectively.Back to article page