noun
person reporting symptoms; symptomatic individual
Used in medical, epidemiological, or health survey contexts to refer to someone who has reported having symptoms of a disease or condition.
調査では、有訴者の割合が前年より増加した。
In the survey, the proportion of people reporting symptoms increased from the previous year.
有訴者の中には、発熱を訴える人が多かった。
Among those reporting symptoms, many complained of fever.
Compound of 有 (ゆう, 'have') + 訴 (そ, 'appeal, report') + 者 (しゃ, 'person'). The term is a modern coinage used in medical and public health fields.