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Table 1 Baseline number of GBS cases among vaccinated individuals, November 2, 2009 - February 7, 2010

From: Estimating background rates of Guillain-Barré Syndrome in Ontario in order to respond to safety concerns during pandemic H1N1/09 immunization campaign

Week of Vaccination Campaign

Projected number of individuals vaccinated in Ontario

Projected cumulative baseline number of GBS cases

 

32% coverage

38% coverage

32% coverage

38% coverage

Week 1: Oct 26 - Nov 1

240,322

285,382

N/A

N/A

Week 2: Nov 2 - Nov 8

418,444

496,902

0.04 - 0.11

0.05 - 0.13

Week 3: Nov 9 - 15

519,186

616,533

0.17 - 0.40

0.20 - 0.48

Week 4: Nov 16 - 22

970,861

1,152,898

0.39 - 0.93

0.46 - 1.1

Week 5: Nov 23 - 29

1,057,184

1,255,406

0.79 - 1.9

0.94 - 2.2

Week 6: Nov 30 - Dec 6

634,192

753,103

1.4 - 3.3

1.6 - 3.9

Week 7: Dec 7 - 13

239,874

284,850

2.1 - 5.0

2.5 - 6.0

Week 8: Dec 14 - 20

72,191

85,726

2.8 - 6.7

3.3 - 8.0

Week 9: Dec 21 - 27

29,887

35,491

3.5 - 8.3

4.1 - 9.9

Week 10: Dec 28 - Jan 3

0

0

4.0 - 9.6

4.8 - 11.4

Week 11: Jan 4 - 10

0

0

4.4 - 10.5

5.2 - 12.5

Week 12: Jan 11 - 17

0

0

4.6 - 11.0

5.5 - 13.0

Week 13: Jan 18 - 24

0

0

4.7 - 11.1

5.5 - 13.2

Week 14: Jan 25 - 31

0

0

4.7 - 11.2

5.6 - 13.3

Week 15: Feb 1 - 7

0

0

4.7 - 11.2

5.6 - 13.3