positivity rate
noun [ C ] uk/ˌpɒz.əˈtɪv.ə.ti ˌreɪt/ us/ˌpɑː.zəˈtɪv.ə.t̬i ˌreɪt/ (US also percent positive)
阳性百分比（即某一疾病的所有测试结果呈阳性的数量，以百分比表示）
the number of all tests for an illness that are positive (= show that someone has the illness), expressed as a number out of a hundred
These numbers probably underestimate the true positivity rate. 这些数字可能低估了真正的阳性百分比。
Quick testing has been successful in identifying people who were HIV positive, with as much as a 3% positivity rate. 快速检测在识别HIV阳性者方面是成功的，阳性率高达3%。
- More examples
- Chan et al. reported a high positivity rate of 52.1 % in patients investigated during the SARS epidemic.
- Seroprevalence studies have shown a positivity rate of the order of 30% in North America and Europe.
- Other investigators either failed to detect viral DNA, or reported low positivity rates.