Fig. 2.

Chronological order of infection confirmation for community 1 (families A and B). Red and grey open circles represent positive and negative viral RT-qPCR test results, respectively. Orange open circles represent uncertain viral RT-qPCR test results. Half-filled red circles represent positive IgM test results. Filled red circles represent positive IgM and IgG test results. Cases 8, 13, and 15 were asymptomatic; cases 10, 12 were two elderly patients who received tests after they were overwhelmed by infection. Serum samples from the day of infection confirmation for IgM and IgG tests were not available for cases 4, 10, 15, 18, 23.