noun
close contact; high-risk contact
Medical/public-health term for a person who has been in close contact with an infected individual, especially during infectious disease outbreaks.
新型コロナウイルスの濃厚接触者に指定された。
I was identified as a close contact of a COVID-19 case.
濃厚接触者は自宅待機が求められる。
Close contacts are required to stay at home.