Measured by the average number of people who become sick from an infectious person, the site tracks the effective reproduction rate (Rt) of COVID-19 infections. If the value is less than one, the spread of the disease is slowing. The higher the Rt number is, the worse the spread.
Editor’s note: Due to ties, lists may not end on No. 10.
10 states with fastest spread of COVID-19
1. Kansas — 1.25
2. Arkansas — 1.19
3. Massachusetts — 1.18
4. Nebraska — 1.17
Minnesota — 1.17
5. Tennessee — 1.14
Virginia— 1.14
California — 1.14
6. New Mexico — 1.13
North Dakota — 1.13
10 states with slowest spread of COVID-19
1. Vermont — 0.82
2. Montana — 0.84
3. Ohio — 0.86
4. Florida — 0.87
5. Hawaii — 0.91
6. Washington — 0.93
7. Idaho — 0.96
8. Louisiana — 0.97
Missouri — 0.97
9. Wyoming — 0.99
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