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Table 1 Annual distribution of B. pertussis in sporadic, community-based and facility-based outbreak settings

From: Bordetella pertussisin sporadic and outbreak settings in Alberta, Canada, July 2004 – December 2012

  Sporadic cases Community-based outbreak Facility-based outbreak
  Suspected Confirmed (%) No. of outbreaks Suspected Confirmed (%) No. of outbreaks Suspected Confirmed (%)
Complete period 21,484 1,423 (6.6)1 21 1,598 191 (12.0)1 24 124 38 (30.6)1
2004* 2,611 280 (10.7) 6 678 76 (11.2) 5 14 1 (7.1)
20052,3,4 4,175 304 (7.3) 3 79 12 (15.2) 4 42 20 (47.6)
2006 2,841 145 (5.1)2 2 220 17 (7.7) 1 1 0 (0.0)
2007 2,023 97 (4.8)2 1 6 6 (100.0) 2 11 0 (0.0)
2008 2,359 187 (7.9) 1 14 7 (50.0)3 5 32 3 (9.4)4
2009 1,905 116 (6.1) 3 319 44 (13.8) 3 4 0 (0.0)
2010 1,161 35 (3.0)2 0 0 NA 3 19 14 (73.7)
2011 1,157 47 (4.1)2 4 158 22 (13.9) 0 0 NA
2012 3,252 212 (6.5) 1 124 7 (5.6) 1 1 0 (0.0)
  1. *Only 6 months of data included for 2004 (July to December).
  2. 1p < 0.001, Chi-squared test excluding eight sporadic cases with indeterminate PCR results.
  3. 2p < 0.01, binary logistic regression with Bonferroni correction using 2005 as the reference year excluding 2004 (6 months only).
  4. 3p < 0.05, binary logistic regression with Bonferroni correction using 2005 as the reference year excluding 2004 (6 months only) and 2010 (no community-based outbreak).
  5. 4p < 0.05, binary logistic regression with Bonferroni correction using 2005 as the reference year excluding 2004 (6 months only) and 2011 (no facility-based outbreak).