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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)