Table 4. Estimates of the reproduction number across influenza pandemic locations in the Americas , 1918–19*.
| Location, north to south | Time of pandemic wave | R estimate |
Source | |
|---|---|---|---|---|
| 3-d serial interval | 6-d serial interval | |||
| 45 US cities† | 1918 autumn† | 1.7–1.8 | 2.5–3.3 | (2,22) |
| Toluca | 1918 spring | 1.6–1.8 | 2.4–3.1 | (3) |
| Toluca | 1918 autumn | 2.0–2.5 | 3.2–6.1 | (3) |
| Mexico City | 1918 spring | 1.3–1.3 | 1.7–1.8 | (3) |
| Mexico City | 1918 autumn | 1.3–1.3 | 1.6–1.7 | (3) |
| Boyacá, Colombia | 1918 Oct–Nov | 1.4–1.5 | 1.8–2.3 | This study |
| Lima, Peru | 1918 Nov–1919 Feb | 1.3–1.4 | 1.6–2.0 | (4) |
*Values are based on a range of estimates provided by considering different distributions of the generation interval (exponentially distributed latent and infectious periods or fixed generation interval). R, reproduction number. †R estimates are based on the mean of the initial growth rates across 45 US cities.