This has produced 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. | This has produced 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. |