TABLE 1

Risk of Pertussis in Years 2–6 After Fifth Dose of DTaP, Minnesota and Oregon, 2010

Year Minnesota RR (95% CI)Oregon RR (95% CI)
1ReferenceReference
21.9 (1.3–2.9)1.3 (0.6–2.8)
32.6 (1.7–3.8)1.5 (0.7–3.7)
43.2 (2.1–4.8)1.7 (0.8–3.7)
56.1 (4.1–8.9)2.6 (1.2–5.6)
68.9 (6.0–13.0)4.0 (1.9–8.4)
  • RR, relative risk.