They stayed in a room 4.5 meters apart 16 minutes. During this time, they didn't speak or touch the same object. Patient B took off his mask and ate twice, and then Patient A took off his mask and made a phone call.
The above details are disclosed in the paper "Coronavirus Pneumonia-19 Epidemic Situation-Nangong City, Hebei Province, China 202 1 year 1 month" (COVID-19 outbreak occurred in Nangong City, Hebei Province in 2002 1 month). The authors are from China CDC and Hebei CDC respectively.
Extended data
Since then, all COVID-19 cases in Nangong City have been related to patient A:
According to the analysis of the whole genome sequence of Hebei CDC, compared with Wuhan reference strain (NC_0455 12), the virus nucleic acid sample of patient A has the characteristics of European L genotype family locus mutation, which is located in branch B.1.123. The genome sequence has 2 1 nucleotide mutation, which is the same as the virus sample in Gaocheng area. The gene sequences of the viruses of patient A and patient B are highly homologous.
The characteristics of transmission chain showed that all COVID-19 cases in Nangong City were related to patient A, and there were intra-unit transmission, family gathering transmission, hospital infection and community transmission related to patient A. Eight generations of infection were observed in the transmission chain.
China CDC disclosed the details of the first case of COVID-19 infection in Nangong, Hebei Province: taking off the mask at the hospital and making a phone call.