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Table 1 Comparison of main characters of patients of primary and secondary dengue

From: Differentiating secondary from primary dengue using IgG to IgM ratio in early dengue: an observational hospital based clinico-serological study from North India

Characteristic Total patients Primary dengue Secondary dengue P value
N = 114 N = 38 (33.3%) N = 76 (66.7%)
Sex % (n)
 Males 70.2% (80) 76.3% (29) 67.1% (51) 0.387
 Females 29.8% (34) 23.7% (9) 32.9% (25)
Age (mean ± SD), Years 38.52 ± 10.99 42.18 ± 11.64 36.68 ± 10.24 0.011
Max temp. (mean ± SD), Fahrenheit 101.2 ± 1.51 100.79 ± 1.25 101.56 ± 1.558 0.015
Platelet count (mean ± SD) × 103/micl 67.16 ± 45.31 100.45 ± 38.66 50.51 ± 38.91 <0.0001
IgM index (mean ± SD) 1.21 ± 0.85 1.45 ± 1.24 1.09 ± 0.55 0.032
IgG index (mean ± SD) 2.81 ± 1.92 0.30 ± 0.14 4.06 ± 0.88 <0.0001
Ig M D2 % (N) 51.8% (59) 44.7% (17) 55.3% (42) 0.324
IgM D7 % (N) 96.5% (110) 97.4% (37) 96.1 (73) 1.0
IgG % (N) 66.7% (76) 0% 100% (76) <0.0001
IgG/ IgM (mean ± SD) 3.22 ± 2.91 0.34 ± 0.27 4.65 ± 2.53 <0.0001
Dengue fever %(n) 73.7% (84) 97.4% (37) 61.8 (47) <0.0001
DHF/DSS % (N) 26.3% (30) 2.6% (1) 38.2% (29)
NS1 % (N) 90.4% (103) 92.1% (35) 89.5% (68) 0.749
  1. This table shows the characteristics of the patients studied and compares amongst the primary and secondary cases
  2. Abbreviations: N number, SD standard deviation, DHF dengue hemorrhagic fever, DSS dengue shock syndrome, NS1 nonstructural protein 1 antigen, Ig M D2 IgM done on day 2, Ig M D7 IgM done on day 7