Volume 19, Number 5—May 2013
Research
World Health Organization International Standard to Harmonize Assays for Detection of Hepatitis E Virus RNA
Figure 3

Figure 3. . . Histograms showing potencies of sample 2 (A), sample 3 (B), and sample 4 (C) compared with sample 1, the candidate World Health Organization International Standard for hepatitis E virus RNA for nucleic acid amplification technique (NAT)–based assays. White indicates quantitative assays (log10 copies/mL); gray indicates qualitative assays (log10 NAT–detectable units/mL). Number of laboratories is indicated on the vertical axis. Laboratory code numbers are indicated in the respective boxes.
1Members of the HEV Collaborative Study Group are listed at the end of this article.
2In memory of Thomas Laue.