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As a potential source of infection, the risk of close contacts has gradually increased. Close contact management mode and epidemiological characteristics for 20,254 close contacts from January 22, 2020 to April 1, 2021 in Chengdu, China were analyzed. The relationship with index cases was mainly co-passengers (73.52%) and relatives (13.64%), and the frequency of contact was mainly occasional contact (68.31%). 277 (1.37%) close contacts who were converted into cases were mainly found in the first and second nucleic acid tests (58.27%), and the contact mode was mainly by sharing transportation (37.55%). In terms of close contact management time, both the supposed ((13.00±3.23) vs. (12.84 ±6.91)) and actual ((14.13±24.02) vs. (14.00±12.98)) isolation time in Chengdu were longer than that of outer cities (P |
