Table 3.

Mean estimates of the reproduction number and corresponding 95% confidence intervals for the 2009 A/H1N1 influenza pandemic by geographic region

Distribution of generation interval	Geographic area
	Northern area		Central area		Southern area
	3-day serial interval	4-day serial interval	3-day serial interval	4-day serial interval	3-day serial interval	4-day serial interval
Exponentially-distributed	1.19 (1.13, 1.24)	1.25 (1.18, 1.32)	1.32 (1.27, 1.37)	1.43 (1.36, 1.50)	1.58 (1.45, 1.72)	1.81 (1.62, 2.0)
Fixed generation interval	1.19 (1.14, 1.25)	1.27 (1.19, 1.35)	1.34 (1.29, 1.40)	1.48 (1.40, 1.57)	1.68 (1.50, 1.87)	1.99 (1.72, 2.30)

The epidemic growth phase used to estimate the reproduction number consisted of 38 days for the northern area (May 18th to June 24th), 30 days for the central area (May 18th to June 16th) and 18 days for the southern area (May 18th to June 4th).