Table 2.

 Estimates of the reproductive number the mean of the serial interval (SI) is 3·6 days with SD of 1·6 days (7) or mean of 1·91 days and SD of 1 days (10)

	4/25/09	4/26/09	4/27/09	4/28/09
(confidence interval); mean SI = 3·6 days
Original data	3·48 (2·88, 3·72)	3·29 (2·85, 3·47)	2·87 (2·55, 3·06)	2·59 (2·31, 2·77)
	2·57 (2·39, 3·13)	2·48 (2·30, 2·81)	2·25 (2·04, 2·46)	2·05 (1·80, 2·16)
Imputed data	3·56 (2·90, 3·80)	3·65 (3·10, 3·88)	3·83 (3·46, 4·12)	3·53 (3·23, 3·70)
	2·61 (2·43, 3·19)	2·68 (2·50, 3·14)	2·78 (2·69, 3·23)	2·61 (2·47, 2·86)
Augmented data	3·62 (2·94, 3·89)	3·79 (3·27, 4·05)	4·11 (3·74, 4·42)	3·94 (3·72, 4·22)
	2·66 (2·48, 3·23)	2·79 (2·61, 3·26)	2·97 (2·88, 3·45)	2·88 (2·79, 3·19)
(confidence interval); mean SI = 1·91 days
Original data	1·99 (1·77, 2·26)	1·86 (1·71, 2·08)	1·72 (1·55, 1·90)	1·63 (1·51, 1·80)
	1·76 (1·64, 2·11)	1·66 (1·54, 1·88)	1·54 (1·39, 1·71)	1·45 (1·32, 1·59)
Imputed data	2·03 (1·79, 2·31)	2·05 (1·85, 2·30)	2·22 (2·11, 2·53)	2·04 (1·97, 2·28)
	1·80 (1·68, 2·17)	1·78 (1·68, 2·09)	1·87 (1·85, 2·23)	1·74 (1·70, 2·00)
Augmented data	2·05 (1·80, 2·35)	2·11 (1·95, 2·38)	2·34 (2·27, 2·66)	2·20 (2·18, 2·45)
	1·82 (1·69, 2·16)	1·84 (1·75, 2·14)	1·97 (1·97, 2·32)	1·87 (1·85, 2·08)
Num cases
Original data	275	392	529	681
Imputed data	282	435	689	940
Augmented data	295·0	471·3	786·3	1130·6

Italicized results reflect results accounting for an 11% per day increase in reporting fraction starting April 13.