Antibiotics have undoubtedly been one of the milestone scientific developments of the twentieth century. Their use in both humans and animals has led to significant advances in the health of humans and has given the medical profession an armoury of very powerful tools to combat specific diseases. We almost take it for granted that a visit to the doctor will yield a targeted medicinal programme that will neutralise nearly all infections. In animals similarly, the use of antibiotics has enabled us to make great inroads into the control of most endemic and exotic diseases that are related to bacterial infections. As a consequence, animal productivity globally has also improved exponentially in the last 50 years or so.
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