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Penicillins are a certain collection of antibiotics that eliminate infection causing bacteria. Also known in short as pen or PCN, they originate from a type of fungi called Penicillium fungi. They are used in the treatment or prevention of many different bacterial infections, usually caused by Gram-positive organisms.
A substance, such as penicillin, that is capable of destroying or weakening certain microorganisms, especially disease-causing bacteria or fungi. Antibiotics are obtained from other microorganisms, especially molds.