Serial, ten-fold dilutions of full - length XMRV (VP62) plasmid (kindly provided by Robert Silverman) in a background of human DNA (PBMC or whole blood) showed that the nested gag and pol PCR tests each detected 10 XMRV copies in different
experiments on subsequent days (34/34 (100 %) and 32/34 (94.1 %), respectively).