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Background
COVID‐19 has become a global pandemic, and close contacts and asymptomatic patients are worthy of attention.
Methods
A total of 1844 people in close contacts with 76 COVID‐19 patients were investigated, and nasopharyngeal swabs and venous blood were collected for centralized medical quarantine observation. Real‐time fluorescence was used to detect SARS‐CoV‐2 nucleic acid in nasopharyngeal...