Table 2 Estimates of the probabilities of infection and symptomatic infection

2005

0.030

1.3 %

0.026

1.0 %

0.024

0.9 %

(0.027–0.034)

(1.1–1.5)

(0.018–0.036)

(0.6–1.4)

(0.019–0.028)

(0.7–1.2)

2006

0.019

0.8 %

0.019

0.7

0.015

0.6 %

(0.017–0.021)

(0.7–0.9)

(0.013–0.026)

(0.4–1.0)

(0.012–0.018)

(0.5–0.8)

2007

0.035

1.4 %

0.040

1.4 %

0.032

1.3 %

(0.031–0.040)

(1.2–1.7)

(0.028–0.054)

(0.9–2.2)

(0.026–0.038)

(1.0–1.6)

2008

0.043

1.7 %

0.047

1.7 %

0.041

1.6 %

(0.038–0.049)

(1.5–2.0)

(0.033–0.064)

(1.1–2.6)

(0.033–0.049)

(1.3–2.1)

2009

0.032

1.3 %

0.034

1.2 %

0.032

1.3 %

(0.028–0.036)

(1.1–1.5)

(0.024–0.046)

(0.8–1.8)

(0.026–0.038)

(1.0–1.6)

2010

0.019

0.8 %

0.019

0.7 %

0.019

0.8 %

(0.019–0.022)

(0.6–0.9)

(0.013–0.025)

(0.4–1.0)

(0.015–0.023)

(0.6–1.0)

2011

0.026

1.1 %

0.027

1.0 %

0.025

1.0 %

(0.023–0.030)

(0.9–1.3)

(0.019–0.036)

(0.6–1.5)

(0.020–0.030)

(0.8–1.3)