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. 2006 Apr;44(4):1283–1287. doi: 10.1128/JCM.44.4.1283-1287.2006

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Copyright © 2006, American Society for Microbiology

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FIG. 1. — Proportions of positive results (y axis) achieved globally by participants in each test sample (virus concentration per sample is depicted on the x axis). Letters at datum points identify virus strain present per sample (V, vaccinia virus; CM, camelpox; C, cowpox; no letter, monkeypox). (A) Reevaluated results from the first EQA study on bioterrorism-relevant viruses (orthopoxvirus data points only). (B) Global results from this study. (C) Results from first-time participants in this study (see the text). (D) Results from second-time participants in this study.