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[[Antibiotic]]s are [[medicine]]s that can weaken or kill [[bacteriamicro-organism]] s when they have [[infection|infected]] an [[organism]]. ===About Antibiotics===: [[Antibiotic]]s are mostly used to treat [[Pathogenic Bacteria|bacterial]] [[infection]]s. However, they can be used to treat some [[Pathogenic Fungus|fungal]] [[infection]]s.: [[Antibiotic]]s were discovered by [[Alexander Fleming]]. However, the use of [[substance]]s which contain [[antibiotic]]s has been taking place for thousands of years with many ancient remedies involving the use of [[mould]] which is made of [[fungi]] which produce [[antibiotic]]s.: The first [[antibiotic]] to be discovered and isolated was [[Penicillin]].: [[Alexander Fleming]] discovered [[penicillin]] after accidentally contaminating a [[Culture Medium|culture medium]] and noticing that [[bacteria]]l colonies would not grow near some [[mould]] colonies. The [[mould]] was known as [[Penicillium]] so the [[chemical]] that was killing the [[bacteria]] was called [[Penicillin]].: [[Antibiotics]] work by damaging the [[Cell Wall|cell walls]] of some [[micro-organism]]s. Once the [[micro-organism]] is weakened the [[Immune System|immune system]] of the [[host]] [[organism]] can more easily kill the [[micro-organism]].