Hi, Maria Serena, you can use the rPCR reported by Olvera et al., 2004 ( you can find enclosed a copy) this assay is based on taqman probe principle. You can also use the method published by our group (you can also find enclosed a copy) which is based SYBR-green.
I hope that you are fine! We use an inhouse taqman qRT-PCR based on 125bp ORF1 replacase of PCV-2 with Pri-pro ET-system. I'm currently outof office but if you are intressted I can send you a detail protocol early nex tweek.
I would like to take the opportunity to wish you and your family a happy and healthy new year. I hope 2015 brings a lot of success in your life and work.