Table 1 Estimated proportion of infections caused by each age group.

Rows show the receiving (i.e., infectee) age groups, and columns show the sources of infection (i.e., infector age groups). The numbers are the mean (95% CrI) estimates in percentage. For instance, for <1-year-olds (top row), on average, 16.3% of cases were infected by the same age group, 44.6% by 1- to 4-year-olds, 20.9% by 5- to 17-year-olds, 15.2% by 18- to 49-year-olds, and 3% by 50+-year-olds.

Infectee
age
groups
Infector age groups
<1 year1–4
years
5–17
years
18–49
years
50+
years
<1 year16.3
(12.3–21.0)
44.6
(35.5–53.5)
20.9
(13.9–28.4)
15.2
(9.6–21.6)
3.0
(1.4–5.0)
1–4 years1.8
(1.0–3.0)
85.8
(77.0–91.9)
7
(3.2–12.9)
5
(2.2–9.3)
0.3
(0.1–0.6)
5–17 years1.5
(0.9–2.4)
12.9
(6.9–21.3)
80.9
(70.4–88.4)
4.4
(2.0–8.0)
0.3
(0.1–0.5)
18–49 years2.4
(1.5–3.7)
18.6
(10.9–28.0)
9.1
(4.8–14.9)
69.5
(56.2–80.8)
0.4
(0.2–0.8)
50+ years15.5
(11.6–19.9)
40.1
(31.1–49.3)
19.7
(13.0–27.0)
15.6
(9.7–22.4)
9.1
(3.8–16.3)