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an antibiotic polypeptide derived by the hydrolytic action of Bacillus subtilis on protein, primarily used topically in the treatment of superficial infections caused by susceptible Gram-positive organisms.
an antibiotic used mainly in treating bacterial skin infections: obtained from the bacterium Bacillus subtilis

bacitracin bac·i·tra·cin (bās’ĭ-trā’sĭn)
A polypeptide antibiotic obtained from a strain of the bacterium Bacillus subtilis and used as a topical treatment for certain bacterial infections, especially those caused by cocci.


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