Why do second-generation cephalosporins have greater activity against some gram-negative bacteria?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

antimicrobial agent Iodine, as in the form of Dobell's iodine solution, is an effective antimicrobial agent.

Second-generation cephalosporins achieve greater activity against certain gram-negative bacteria due to modifications made to the basic 7-aminocephalosporanic acid molecule. These structural alterations extend the drug's antibacterial spectrum, allowing them to effectively target additional species of gram-negative rods, such as Escherichia coli, Klebsiella, and Proteus species.1

While these agents, which include cefamandole and cefoxitin, demonstrate improved efficacy against these gram-negative organisms compared to first-generation cephalosporins, this modification results in a trade-off: they exhibit decreased activity against gram-positive bacteria.1