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Table 4 Characteristics of the indeterminate samples by UW-WB and Kalon (index cut-off = 1.1)

From: Precision of the Kalon Herpes Simplex Virus Type 2 IgG ELISA: an international inter-laboratory assessment

  Indeterminate by UW-WB Indeterminate by Kalon (index: 0.9–1.1) a
Total (No.) 16 10
GUD Presentation by Physical Exam (No.) 0 0
Medical History of GUD in past 3 months (No.) 0 0
HIV Prevalence, % (n/N) 25.0 (4/16) 30.0 (3/10)
Median Age, years (IQR) 33.0 (25.9, 39.2) 31.4 (26.4, 35.8)
Country of Origin (No.)
 South Africa 4 5
 Zambia 12 5
Kalon Result (No.) a   
 Negative 5
 Indeterminate 1
 Positive 10
UW-WB (No.)
 Negative 2
 Indeterminate 1
 Positive 7
  1. Abbreviations: UW-WB University of Washington HSV Western Blot, GUD genital ulcer disease, and IQR interquartile range
  2. aKalon results were produced in the HPTN Laboratory Center (USA site) by Technologist-Sr. and were interpreted by the manufacturer’s index cut-offs: (<0.9, negative; 0.9–1.1, indeterminate; >1.1, positive)
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