Table 2.

Upper Bounds of R_E(t) for Different Weeks in Different Geographic Regions of the United States During the Fall of 2009^a

Region	Weeks 44–46	Weeks 45–47	Weeks 46–48	Weeks 47–49
1	0.862	0.788	0.767	0.732
2	0.879	0.827	0.842	0.845
3	0.815	0.714	0.745	0.730
4	0.874	0.868	0.938	0.936
5	0.814	0.801	0.782	0.773
6	0.853	0.790	0.823	0.913
7	0.753	0.752	0.838	0.780
8	0.767	0.843	0.870	0.839
9	0.902	0.998	0.886	0.786
10	0.847	0.793	0.804	0.823

Abbreviation: R_E(t), effective reproduction number.

^aThe regions are defined as follows: region 1—Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont; region 2—New Jersey, New York, Puerto Rico, and US Virgin Islands; region 3—Delaware, District of Columbia, Maryland, Pennsylvania, Virginia, and West Virginia; region 4—Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, and Tennessee; region 5—Illinois, Indiana, Michigan, Minnesota, Ohio, and Wisconsin; region 6—Arkansas, Louisiana, New Mexico, Oklahoma, and Texas; region 7—Iowa, Kansas, Missouri, and Nebraska; region 8—Colorado, Montana, North Dakota, South Dakota, Utah, and Wyoming; region 9—Arizona, California, Guam, Hawaii, and Nevada; and region 10—Alaska, Idaho, Oregon, and Washington.