Table 1 Estimated basic reproductive numbers.

Estimated basic reproductive numbers (Rt) for the New York, New Orleans, Los Angeles, Chicago, Boston, and Miami metropolitan areas on 15 March, 29 March, 12 April, 26 April, and 3 May. Mean estimate (95% CIs) are presented.

15 March29 March12 April26 April3 May
New York3.10 (2.76, 3.45)1.63 (1.41, 1.88)0.60 (0.52, 0.66)0.38 (0.32, 0.43)0.34 (0.30, 0.40)
New Orleans2.50 (2.11, 2.89)1.91 (1.65, 2.27)0.44 (0.34, 0.55)0.29 (0.22, 0.36)0.27 (0.21, 0.34)
Los Angeles3.12 (2.56, 3.72)1.35 (1.06, 1.71)1.16 (0.89, 1.38)1.17 (0.89, 1.44)1.18 (0.91, 1.44)
Chicago2.84 (2.41, 3.34)2.04 (1.74, 2.36)1.11 (0.92, 1.29)1.39 (1.14, 1.66)1.13 (0.92, 1.34)
Boston3.86 (3.28, 4.47)2.19 (1.73, 2.57)0.95 (0.77, 1.08)0.41 (0.32, 0.54)0.33 (0.26,0.40)
Miami2.96 (2.56, 3.45)1.38 (1.12, 1.68)0.78 (0.60, 0.96)0.76 (0.57, 0.88)1.32 (1.07, 1.52)