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Table 2 Sensitivity of the different diagnostic tools for NS1 detection in plasma, urine and saliva

From: Evaluation of the performances of six commercial kits designed for dengue NS1 and anti-dengue IgM, IgG and IgA detection in urine and saliva clinical specimens

 

Total

Primary infection

Secondary infection

Plasma

ELISA

All samples

66 % (159/241)

95.7 % (66/69)

51.1 % (69/135)

  

DAOF ≤ 3

94.4 % (67/71)

100 % (29/29)

88.6 % (31/35)

  

DAOF 4–7

66.7 % (82/123)

93.9 % (31/33)

51.4 % (36/70)

  

DAOF 8–12

21.3 % (10/47)

85.7 % (6/7)

6.7 % (2/30)

Urine

ELISA

All samples

14.3 % (63/440)

18.3 % (23/126)

8.1 % (20/246)

  

DAOF ≤ 3

9.9 % (8/81)

15.6 % (5/32)

2.4 % (1/41)

  

DAOF 4–7

19.2 % (52/271)

21.5 % (17/79)

12.3 % (19/154)

  

DAOF 8–12

3.4 % (3/88)

6.7 % (1/15)

0 % (0/51)

Urine

RDT

All samples

15.5 % (68/440)

18.3 % (23/126)

10.6 % (26/246)

  

DAOF ≤ 3

11.1 % (9/81)

15.6 % (5/32)

4.9 % (2/41)

  

DAOF 4–7

21 % (57/271)

21.5 % (17/79)

15.6 % (24/154)

  

DAOF 8–12

2.3 % (2/88)

6.7 % (1/15)

0 % (0/51)

Saliva

ELISA

All samples

24.7 % (72/291)

43.5 % (37/85)

15.5 % (27/174)

  

DAOF ≤ 3

25.5 % (12/47)

41.2 % (7/17)

19.2 % (5/26)

  

DAOF 4–7

29.9 % (55/184)

46.7 % (28/60)

19.4 % (21/108)

  

DAOF 8–12

8.3 % (5/60)

25 % (2/8)

2.5 % (1/40)

Saliva

RDT

All samples

20.8 % (60/289) b

31 % (26/84) a

16.2 % (28/173) a

  

DAOF ≤ 3

14.9 % (7/47)

23.5 % (4/17)

11.5 % (3/26)

  

DAOF 4–7

25.7 % (47/183) a

33.9 % (20/59) a

19.4 % (21/108) a

  

DAOF 8–12

10.2 % (6/59) a

25 % (2/8)

10.3 % (4/39) a

  1. The sensitivity of the different diagnostic tools for NS1 detection in plasma, urine and saliva of DENV-infected patients is presented according to the time of sampling after the onset of the fever and the immune status of the patients
  2. DAOF Day After Onset of Fever
  3. a One invalid result
  4. b Two invalid results