noun
notifiable infectious disease; legally reportable infectious disease
A disease that physicians are legally required to report to public health authorities. This term is used in Japanese public health law.
医師は法定伝染病を診断した場合、保健所に届け出なければならない。
When a doctor diagnoses a notifiable infectious disease, they must report it to the public health center.
感染症 is a broader term for any infectious disease, while 法定伝染病 specifically refers to those that must be reported by law.
Compound of 法定 (legal, statutory) + 伝染病 (infectious disease). The term reflects its legal definition under Japanese public health regulations.