TABLE 1.

Average daily effective reproduction number (R) for cases of severe acute respiratory syndrome (SARS) with a symptom onset date before or after the issuance of the first global alert against SARS on March 12, 2003, for regions where infection was introduced in late February 2003

Symptom onset	Hong Kong			Vietnam			Singapore			Canada
	R	95% CI*		R	95% CI		R	95% CI		R	95% CI
Before alert	3.6	3.1, 4.2		2.4	1.8, 3.1		3.1	2.3, 4.0		2.7	1.8, 3.6
After alert	0.7	0.7, 0.8		0.3	0.1, 0.7		0.7	0.6, 0.9		1.0	0.9, 1.2

* CI, confidence interval.