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Table 4 Time interval between sequential dengue virus infections by clinical category at infection one and two

From: Sequential dengue virus infections detected in active and passive surveillance programs in Thailand, 1994–2010

   Interval between infections (yrs)
Clinical categorya All data (n = 502) Cohort extended datasetc(n = 195)
Infection one Infection two N Mean Min Max N Mean Min Max
Any Any 502 3.45 0.18 12.57 195 1.85 .27 4.96
Subclinicalb Subclinicalb 45 1.74 0.78 3.25 45 1.74 0.78 3.25
Subclinicalb Symptomatic 26 3.03 0.65 12.26 21 1.84 0.65 4.22
Symptomatic Subclinicalb 23 2.15 0.77 4.96 23 2.15 0.77 4.96
Symptomatic Symptomatic 323 4.27 0.18 12.57 21 2.35 0.27 4.28
  1. aClinical category at infection one and two.
  2. bSubclinical infections were only captured from cohort studies. Symptomatic infections include all symptomatic infections from Bangkok and Kamphaeng Phet. 56 infection one’s and 42 infection two’s were unable to be clinically categorized as symptomatic or subclinical due to occurrence out of the active study surveillance period and not seeking hospital care (listed as ‘Any’ in the table).
  3. cOnly infections in cohort subjects were included in this subgroup; includes infections detected from non-study hospital-basedpassive surveillance within five years after infection one.