antimicrobial spectrum; antibacterial spectrum
Medical term referring to the range of microorganisms against which an antimicrobial agent is effective. Often used in contexts like 抗菌スペクトルが広い (broad-spectrum) or 抗菌スペクトルが狭い (narrow-spectrum).
This antibiotic has a broad antimicrobial spectrum.
We performed a culture test to examine the antimicrobial spectrum.