noun
Category IV infectious disease
A legal classification under Japan's Infectious Diseases Control Law. Category IV includes diseases that can be transmitted from animals to humans or through insects, such as rabies, anthrax, and avian influenza. This term is primarily used in medical, legal, and public health contexts.
狂犬病は四類感染症に指定されています。
Rabies is designated as a Category IV infectious disease.
四類感染症の発生時には、保健所への届け出が必要です。
When a Category IV infectious disease occurs, notification to the public health center is required.
Compound of 四 (four) + 類 (category) + 感染症 (infectious disease). The term was established under Japan's Infectious Diseases Control Law (感染症法) enacted in 1999.