Smallpox and Season: Reanalysis of Historical Data

Figure 3

Estimates of the effective reproduction numbers with time, 𝑅(𝑡). (a)–(f) correspond to locations as chronologically ordered in Figure 1. The horizontal dashed line indicates where the reproduction number is unity. The vertical broken lines represent every January. 𝑅(𝑡) cannot be estimated where the observed number of cases (or deaths) was 0 and is not shown for such time points.

(a)

(b)

(c)

(d)

(e)

(f)

(g)