Fig. 2
From: COVID-19 in Japan, January–March 2020: insights from the first three months of the epidemic
A Proportion of reported contact or exposure type over time by date of report (29 January to 31 March 2020). The vertical dashed line denotes when the testing criteria was expanded. B Age-specific transmission probability matrix by 10-year age groups. The colours represent the probability (red indicating high and blue indicating low) of infector-infectee transmission pairs in each 10-year age-group amongst cases reported up to 31 March 2020 in Japan