Table 1 Descriptive characteristics of pertussis cases
From: Epidemiology of pertussis in Alberta, Canada 2004–2015
Number of cases (%) | ||
|---|---|---|
Total number of cases | 3510 (100) | |
Year of diagnosis | 2004 | 664 (18.9) |
2005 | 452 (12.9) | |
2006 | 211 (6.0) | |
2007 | 128 (3.6) | |
2008 | 239 (6.8) | |
2009 | 193 (5.5) | |
2010 | 68 (1.9) | |
2011 | 114 (3.2) | |
2012 | 326 (9.3) | |
2013 | 302 (8.6) | |
2014 | 378 (10.8) | |
2015 | 435 (12.4) | |
Age groups (years) | <1 | 403 (11.5) |
1–4 | 576 (16.4) | |
5–9 | 539 (15.4) | |
10–14 | 798 (22.7) | |
15–19 | 308 (8.8) | |
20+ | 886 (25.2) | |
Gender | Female | 1882 (53.6) |
Male | 1627 (46.4) | |
Unknown | 1 (0) | |
Health zone | Calgary | 357 (10.2) |
Central | 815 (23.2) | |
Edmonton | 751 (21.4) | |
North | 946 (27.0) | |
South | 406 (11.6) | |
N/Aa | 235 (6.7) | |
Vaccination histories among cases: | ||
Never vaccinated | 1370 (39.0) | |
Vaccinated after disease diagnosis | 515 (14.7) | |
Vaccinated out-of-province | 324 (9.2) | |
Number of people vaccinated in Alberta before diagnosis | 1301 (37.1) | |
Number of doses received by people vaccinated in Alberta prior to disease | 1 | 131 (10.0% of those vaccinated) |
2 | 53 (4.1) | |
3 | 130 (10.0) | |
4 | 247 (19.0) | |
5+ | 740 (56.9) | |
Duration of vaccine protection | 2 weeks to 1 month | 42 (3.2) |
1–2 months | 25 (1.9) | |
2–3 months | 19 (1.5) | |
3 months to 1 year | 94 (7.2) | |
1–3 years | 206 (15.8) | |
3–5 years | 131 (10.1) | |
5+ years | 784 (60.3) | |
Timeliness (Number of cases vaccinated at specified ages for recommended doses) | 2 months | 982 (75.5% of vaccinated cases) |
4 months | 809 (65.4) | |
6 months | 703 (58.8) | |
18 months | 473 (41.6) | |
4–6 years | 755 (80.7) | |
14–16 years | 317 (71.2) | |