bacitracin (băsˌĭtrāˈsĭn) [key], antibiotic produced by a strain of the bacterial species Bacillus subtilis. It is widely used for topical therapy such as for skin and eye infections; it is effective against gram-positive bacteria, including strains of staphylococcus that are resistant to penicillin (see Gram's stain). Bacitracin is toxic to humans and is no longer used internally.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
More on bacitracin from Fact Monster:
See more Encyclopedia articles on: Pharmacology