発はっ症しょう率りつ

noun

incidence rate

Medical term for the rate at which new cases of a disease occur in a population over a given period.

• この地ち域いきのインフルエンザ発はっ症しょう率りつは年ねん々ねん低てい下かしている。

  The influenza incidence rate in this region has been declining year by year.