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A biological preparation that is given to an individual to stimulate their immune system so that it will recognise a particular pathogen in the future. A vaccine usually contains a small amount of the pathogen so that the body will recognise it as foreign and produce antibodies against it.
A vehicle for delivering genetic material, such as DNA, into a cell. Useful in genetic engineering. Often a bacterium.
Animals with backbones.
Small infectious agent that replicates only inside the living cells of other organisms. Can infect all life forms from animals, to plants. Influenza is a virus.
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