Detection of PRRSV infection in serum samples. Five (5) serum samples were tested for PRRSV infection using RT-LAMP and RT-PCR. The output of the RT-LAMP assay was visualized using (A) agarose gel electrophoresis, (C) UV transillumination, and (D) color change with SYBR Green I dye. (B) RT-PCR products were visualized using agarose gel electrophoresis of RT-PCR products. Lanes M; DL2000 Marker (A and B only); 1-5; serum samples.