noun
close contact (with an infected person)
Medical term used in infectious disease contexts, especially during outbreaks like COVID-19, to describe prolonged or unprotected exposure to a confirmed case.
保健所から濃厚接触者として連絡があった。
I was contacted by the public health center as a close contact.
濃厚接触の定義は、マスクなしで15分以上会話することだ。
The definition of close contact is talking without a mask for 15 minutes or more.