This is the 284th most frequent Korean word.
감염증
Infectious disease.
Here, '감염증' refers to a general infectious disease that is spreading.
감염증이 급속히 확산되고 있습니다.
The infectious disease is spreading rapidly.
In this sentence, '감염증' is used to discuss preventative measures against infectious diseases.
감염증 예방을 위해 손을 자주 씻으세요.
Wash your hands frequently to prevent infectious diseases.
This usage of '감염증' indicates a specific infectious disease being addressed in the context of seeking treatment.