A class of substances, usually antibiotics, used at low doses to promote growth in food animals.

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Antimicrobial is a broad term used to describe any agent which interferes with the normal function of microscopic organisms, including bacteria, fungi, yeast, viruses and protozoa. Antibiotics, which [..]

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Refers to the number of living organisms and variability among them and their environments.

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Colonization occurs when a new species of bacteria develops a colony (a group of the same type of bacteria) in a new location, such as the human intestinal tract. Bacteria can colonize a host without [..]

The changes induced by natural or human activity on the ecology and living organisms.