（人が）ハイリスクである

be at high risk
※無冠詞であることなどに注意

be in the high risk category

One of my kids had called my mother, June, and she was there watching. ... she couldn't come close because she has a heart condition and is at high risk if she catches the virus.
https://www.bbc.com/news/uk-52353275
※回復者の体験記より。

The 78-year-old is on full lockdown amid the coronavirus crisis, not stepping outside the house due to being in the high risk category.
https://metro.co.uk/2020/04/29/manchester-united-l...
※サー・アレックス・ファーガソンが家から一歩も出ていないが元気だということを伝える記事より。

Originally created by nofrills on 2020-04-22.
Original page deleted due to title change by nofrills on 2020-04-30.