Fig. 3

Schematic presentation of epdemiological investigation. 0, Unknown source of infection in Wuhan; 1, patient of the present study; 2, daughter-in-law of case 1; 3, older grandson of case 1; 4, daughter of case 1; 5, husband of case 1; 6, older sister of case 1; 7, younger sister of case 1; 8, son of case 1; 9, son-in-law of case 1; 10, granddaughter-in-law of case 1; 11, grandson-in-law of case 1; 12, younger grandson of case 1. The patient was diagnosed with COVID-19 on Jan 28. Her daughter-in-law was diagnosed with COVID-19 on Jan 30, while her husband was diagnosed with COVID-19 on Feb 11. Her daughter and older grandson were found to be asymptomatic carriers. Other family members were negative for SARS-CoV-2 infection at the time of testing