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Table 4 Outbreak size required for P D of 0.5

From: A methodological framework for the evaluation of syndromic surveillance systems: a case study of England

Influenza
 System Coverage Secondary cases T D (days) Symptomatic (thousand)
  EDSSS 15% 1.26 318 81.9
  GPIHSS 64% 1.09 358 3.0
  GPOOHSS 65% 1.22 332 47.7
  NHS-111 100% 1.22 348 63.1
Cryptosporidiosis
 System Coverage People exposed (thousand) T D (days) Symptomatic (thousand)
 (Location A)
  EDSSS 15% 1,750.0 13 492.7
  GPIHSS 64% 11.3 22 3.3
  GPOOHSS 65% 4.2 18 1.3
  NHS-111 100% 12.5 18 3.8
 (Location B)
  EDSSS 23% 512.4 13 144.4
  GPIHSS 95% 2.2 19 0.7
  GPOOHSS 7% 7.8 17 2.3
  NHS-111 100% 3.5 16 1.0
 (Location C)
  EDSSS 47% 284.6 17 84.9
  GPIHSS 86% 2.8 21 0.9
  GPOOHSS 33% 2.4 18 0.7
  NHS-111 100% 4.1 18 1.3
  1. Estimated size of influenza and Cryptosporidium spp. outbreaks required to achieve at least a 0.5 probability of detection per syndromic surveillance system and region