Contact tracing to rapidly isolate people who could be infected with coronavirus disease 2019 (COVID-19) reduced the length of time people were infectious in the community over 4 weeks (from 14 January to 12 February 2020) in Shenzhen, China, according to newly published results from 391 cases and 1,286 of their close contacts.
from Health & Medicine News -- ScienceDaily https://www.sciencedaily.com/releases/2020/04/200427184126.htm
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