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**Material and Methods ...***455 contacts who were exposed to the asymptomatic COVID-19 virus carrier became the subjects of our research. They were divided into three groups: 35 patients, 196 family members and 224 hospital staffs. We extracted their epidemiological information, clinical records, auxiliary examination results and therapeutic schedules ...*https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7219423/