上克通大睾 Concept 1:antibiotic spectrum Shanghai Jiao Tong University Different antibiotics target different kinds of bacteria Antimicrobial spectrum Antimicrobial spectrum of a drug means the species of microorganisms that the drug can inhibit or kill. ©Narrow spectrum The agents act against a single or limited group of microorganisms (isoniazid:mycobacteria Extended spectrum The agent that are effective against gram-positive organisms and also against a number of gram- negative bacteria (ampicillin). ©Broad spectrum The agent affect a wide variety of microbial species (tetracycline)Shanghai Jiao Tong University Concept 1: antibiotic spectrum Different antibiotics target different kinds of bacteria Antimicrobial spectrum Antimicrobial spectrum of a drug means the species of microorganisms that the drug can inhibit or kill. Narrow spectrum The agents act against a single or limited group of microorganisms (isoniazid: mycobacteria ) Extended spectrum The agent that are effective against gram-positive organisms and also against a number of gram- negative bacteria (ampicillin). Broad spectrum The agent affect a wide variety of microbial species (tetracycline)