To put it simply, a close contact is someone who has been in close contact with a sick person (suspected or confirmed) (e.g., in the same transportation, sharing a classroom, living in the same house) but has not taken any protective measures (e.g., wearing a mask, etc.).

Whether or not they are close contacts ultimately requires a professional determination by CDC professionals after conducting an epidemiological investigation.

"Novel Coronavirus Infection Prevention" 11. What is a close contact? I am hitting it in my hand, please wait a moment,

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