noun
Category V infectious disease
A legal classification under Japan's Infectious Diseases Control Law for diseases requiring routine surveillance and basic prevention measures, such as seasonal influenza.
新型コロナウイルス感染症は、2023年5月に５類感染症に移行した。
COVID-19 was reclassified as a Category V infectious disease in May 2023.
Compound of 五類 (ごるい, 'category five') + 感染症 (かんせんしょう, 'infectious disease').