Figure 2From: Standardized positive controls for detection of norovirus by reverse transcription PCRStrategy to produce standardized positive-control plasmids containing cloned viral genes. The four types of resulting plasmids were used to produce RNA transcripts. (A) NoV GI-5 + HRV and NoV GII-4 + HRV, (B) NoV GI-6 + HAV and NoV GII-4 + HAV.Back to article page