noun which may take the genitive case particle 'no'
fulminant; hyperacute; acute and severe
Medical term describing a disease that develops suddenly and severely, often with a rapid, life-threatening course. Used in phrases like 劇症肝炎 (fulminant hepatitis).
劇症肝炎は急激に肝機能が低下する危険な病気です。
Fulminant hepatitis is a dangerous disease in which liver function declines rapidly.
この感染症は劇症化することがあり、早期治療が
This infection can become fulminant, so early treatment is important.
急性 means 'acute' in a general medical sense, while 劇症 specifically implies an extremely rapid and severe progression, often with a poor prognosis.
Compound of 劇 (intense, severe) and 症 (symptom, disease). The exact historical derivation is uncertain, but the term is used in modern medical Japanese to describe fulminant conditions.