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Table 5 Preliminary baseline antibody data (based on a subset of samples of the PREVAC trial participants from version 2.0, 3.0 and 4.0 that were not randomly selected)

From: Partnership for Research on Ebola VACcination (PREVAC): protocol of a randomized, double-blind, placebo-controlled phase 2 clinical trial evaluating three vaccine strategies against Ebola in healthy volunteers in four West African countries

PREVAC baseline antibody titers by age

Age

No.

GMT*

EU/mL

Median (IQR)

EU/mL

5th, 95th percentile

≥ 200 EU/mL

No. (%)

> 607 EU/mL

No. (%)

All children

413

81.3

68 (47, 116)

30, 451

54 (13.1%)

15 (3.6%)

 1–4 years

44

68.2

56 (43, 90)

26, 227

4 (9.1%)

2 (4.5%)

 5–11 years

162

78.4

68 (46, 119)

28, 351

21 (13.0%)

4 (2.5%)

 12–17 years

207

86.9

71 (49, 117)

34, 470

29 (14.0%)

9 (4.3%)

All adults

677

83.7

74 (52, 114)

34, 317

74 (10.9%)

11 (1.6%)

 18–25 years

392

86.0

75 (52, 122)

33, 335

45 (11.5%)

8 (2.0%)

 26–45 years

205

78.7

69 (50, 103)

35, 269

19 (9.3%)

2 (1.0%)

 46+ years

80

86.5

73 (54, 126)

37, 300

10 (12.5%)

1 (1.3%)

All ages

1090

82.8

72 (50, 116)

33, 330

128 (11.7%)

26 (2.4%)

  1. *Geometric mean titer of antibody testing through 22 September 2019