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Table 2 Additional 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

  Projected cumulative additional number of GBS cases
Week of Vaccination Campaign 1992/94 Seasonal Flu
(Lasky et al [10])
1976 Swine Flu
(Schonberger et al [4])
  32% coverage 38% coverage 32% coverage 38% coverage
Week 1: Oct 26 - Nov 1 N/A N/A N/A N/A
Week 2: Nov 2 - Nov 8 0.01 0.02 0.19 0.23
Week 3: Nov 9 - 15 0.16 0.19 1.2 1.4
Week 4: Nov 16 - 22 0.45 0.54 3.4 4.0
Week 5: Nov 23 - 29 0.89 1.1 7.1 8.4
Week 6: Nov 30 - Dec 6 1.6 1.9 12.6 15.0
Week 7: Dec 7 - 13 2.5 3.0 19.7 23.4
Week 8: Dec 14 - 20 3.3 3.9 26.2 31.1
Week 9: Dec 21 - 27 3.8 4.5 30.6 36.4
Week 10: Dec 28 - Jan 3 4.2 4.9 33.1 39.3
Week 11: Jan 4 - 10 4.4 5.2 34.3 40.8
Week 12: Jan 11 - 17 4.5 5.4 34.8 41.3
Week 13: Jan 18 - 24 4.6 5.4 34.9 41.5
Week 14: Jan 25 - 31 4.6 5.5 35.0 41.5
Week 15: Feb 1 - 7 4.6 5.5 35.0 41.5