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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
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BMC Public Health

ISSN: 1471-2458

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