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Vaccine A preparation that contains an antigen,
consisting of whole disease-causing organisms (killed
or weakened) or parts of such organisms, that is
used to confer immunity against the disease that the
organisms cause. Vaccine preparations can be natural,
synthetic or derived by recombinant DNA technology.
Vector The agent (e.g., plasmid or virus) used to carry
new DNA into a cell.
Virion An elementary viral particle consisting of genetic
material and a protein covering.
Virology Study of viruses.
Virulence Ability to infect or cause disease.
Virus A submicroscopic organism that contains genetic
information but cannot reproduce itself. To replicate,
it must invade another cell and use parts of that cell’s
reproductive machinery.
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