LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY
Penicillium fungus and bacterial colonies cultured in a petri dish. The antibiotic penicillin is derived from Penicillium mould. Penicillin drugs can kill bacteria and inhibit their growth, and are used to treat a variety of bacterial infections. However many bacteria have developed resistance, due to inappropriate and widespread use of these drugs.
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