The virus SARS-CoV-2 may be transmitted from person to person, mainly via respiratory droplet or touching of the nose, mouth and eyes after contact with contaminated surfaces. While symptomatic patients are believed to be most contagious, transmission from asymptomatic people may still occur. Contact investigation is an important strategy to detect and isolate infection sources and reduce continuing transmission. This technique has been used to control transmission of other infectious respiratory diseases such as tuberculosis, MERS CoV and SARS.

 

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