This is the 4607th most frequent Korean word.
감염의
"감염의" means "infectious" or "pertaining to infection."
Here, '감염의' is modifying '위험' (risk) to indicate 'risk of infection'.
감염의 위험이 높아졌습니다.
The risk of infection has increased.
In this sentence, '감염의' modifies '확산' (spread) to indicate 'spread of infection'.
그 지역은 감염의 확산을 막기 위해 노력하고 있습니다.
The area is making efforts to stop the spread of infection.
This example uses '감염의' to qualify '가능성' (possibility), expressing 'possibility of infection'.