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. 2021 May 26;21:485. doi: 10.1186/s12879-021-06204-6

Fig. 4.

Fig. 4

Age-specific transmission matrix in South Korea A Infector-infectee matrix for the first epidemic wave (19 January–19 April 2020). The colour in each cell represents the probability of infector-infectee pairs of the respective ages. B Infector-infectee matrix for the second epidemic wave (20 April–11 August 2020)