Fig. 7

Comparison of the number of secondary cases in households with c1 ≤ 1 (early-diagnosed primary) and those with c1 > 1 (late-diagnosed primary): a. type A and b. type B
Comparison of the number of secondary cases in households with c1 ≤ 1 (early-diagnosed primary) and those with c1 > 1 (late-diagnosed primary): a. type A and b. type B