弱じゃく毒どく

noun

low toxicity; low virulence

Medical term describing a pathogen or substance with reduced harmful effects. Often contrasted with 強毒 (high virulence).

See also: 強毒

• このウイルスは弱じゃく毒どく株かぶなので、症しょう状じょうは軽かるい。

  This virus is a low-virulence strain, so symptoms are mild.

noun

attenuation

Refers to the process or state of reducing virulence, often in vaccine development. Related term: 弱毒化 (attenuation process).

See also: 弱毒化

• ワクチンには弱じゃく毒どくした病びょう原げん体たいが使つかわれることがある。

  Attenuated pathogens are sometimes used in vaccines.