
A B C D E F G H I K L M N O P R S T V W X Y
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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