noun which may take the genitive case particle 'no', noun
subacute
Medical term describing a condition or disease that is intermediate between acute and chronic in onset and duration.
亜急性甲状腺炎は、ウイルス感染が原因と考えられている。
Subacute thyroiditis is thought to be caused by a viral infection.
慢性 means 'chronic' (long-lasting, slow progression), whereas 亜急性 is intermediate in duration and severity.
Compound of 亜 (a, 'sub-') + 急性 (kyūsei, 'acute'). The prefix 亜 indicates a lesser or secondary degree, forming a medical term for conditions that are not fully acute.