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A [[chemical]] secreted by a living [[organism]] that kills or reduces the reproduction rates of other organisms.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> Antibiotics gradually lose effectiveness when used by an individual, as the strain of antibiotics infecting the individual evolves to become resistant to the antibiotic.<ref>http://www.chemheritage.org/educationalservices/pharm/antibiot/readings/evolve.htm</ref>

A [[chemical]] that kills or reduces the reproduction rates of organisms.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> Such chemicals may be secreted by living organisms (such as [[penicillin]], which is produced by certain moulds) or they may be artificially sythesized. Antibiotics gradually lose effectiveness when used by an individual, as the strain of antibiotics infecting the individual evolves to become resistant to the antibiotic.<ref>http://www.chemheritage.org/educationalservices/pharm/antibiot/readings/evolve.htm</ref>. This has led to various strains of bacteria that lead to infections that cannot be treated with the more common antibiotics. An example is the MRSA strain of [[Staphylococcus Aureus]], that is resistant to all [[penicillin]]-type antibiotics.

==References==

==References==