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The unique protein on the surface of a cell. It is recognised by the immune system as ‘self’ or ‘non self’.

Antibiotics

Culture medium

The nutrient jelly on which many microorganisms are cultured.

Mutation

Inoculate

Natural selection

MRSA

When more causes of an infectious disease are recorded than would normally be expected.

When more causes of a disease are recorded than normal in a number of different countries.