This is the 9777th most frequent Korean word.
고위험군을
"High-risk group."
In this context, '고위험군을' refers to 'high-risk groups' who are mentioned as needing extra care.
고위험군을 포함한 환자들은 특별히 주의가 필요합니다.
Patients, including those in high-risk groups, require special attention.
Here, '고위험군을' is employed to indicate the object of protection through governmental actions.
공공장소에서 고위험군을 보호하기 위한 조치가 시행되었습니다.
Measures have been implemented to protect high-risk groups in public areas.
In this sentence, '고위험군을' signifies the particular high-risk groups targeted by the study.