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Table 2 Frequency of primary cases as a function of the numbers of secondary cases per primary case. Data are from [9]

From: Low dispersion in the infectiousness of COVID-19 cases implies difficulty in control

Numbers of secondary cases

Frequency of primary cases

0

1241

1

511

2

160

3

71

4

33

5

15

6

7

7

3

8

2

9

3

10

1

11

1

12

1

17

1