R0 estimated in the models of increasing and declining phases based on mortality data and confimed cases of COVID-19 19 up to 29th April2020
| Country | Confirmed cases | Deaths | ||||
| N | R0 Before | R0 After | N | R0 Before | R0 After | |
| USA | 1 551 853 | 3.6 (3.4, 3.8) | 0.97 (0.94, 1.00) | 93 439 | 3.2 (2.7, 3.7) | 0.89 (0.84, 0.94) |
| UK | 248 818 | 2.1, (1.8, 2.3) | 0.99 (0.96, 1.02) | 35 704 | 2.6 (2.4, 2.9) | 0.85 (0.80, 0.90) |
| Italy | 227 364 | 2.2 (2.0, 2.4) | 0.89 (0.87, 0.91) | 32 330 | 3.7 (3.1, 4.4) | 0.81 (0.79, 0.84) |
| France | 143 845 | 2.0 (1.8, 2.1) | 0.76 (0.72, 0.82) | 28 132 | 2.7 (2.4, 3.0) | 0.77 (0.73, 0.80) |
| Spain | 233 286 | 2.2 (2.1, 2.4) | 0.74 (0.71, 0.78) | 27 888 | 3.2 (2.4, 4.1) | 0.78 (0.73, 0.82) |