Anti-infective: Something capable of acting against infection, by inhibiting the spread of an infectious agent or by killing the infectious agent outright. Anti-infective is a general term that encompasses antibacterials, antibiotics, antifungals, antiprotozoans and antivirals.
http://www.medterms.com/script/main/...rticlekey=2285
Antibiotic: A drug used to treat infections caused by bacteria and other microorganisms. Originally, an antibiotic was a substance produced by one microorganism that selectively inhibits the growth of another.
http://www.medterms.com/script/main/...rticlekey=8121
Antibiotics can be batericidal (kills) or bateristatic (inhibits growth).