noun
Category I infectious disease
A legal classification under Japan's Infectious Diseases Control Law for the most dangerous diseases, such as Ebola, plague, and smallpox. Requires the strictest containment measures.
エボラ出血熱は一類感染症に指定されている。
Ebola hemorrhagic fever is designated as a Category I infectious disease.
一類感染症の患者が発生した場合、厳重な隔離措置が取られる。
When a patient with a Category I infectious disease appears, strict isolation measures are taken.
Compound of 一類 (first category) and 感染症 (infectious disease), reflecting the legal classification system.