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14 Cards in this Set

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virus
a collection of genetic infomation directed toward self repilcation
virion
a virus particle that cannot grow or divide
live virus
a virus that is capable of infecting a cell
bacteriophage
a virus that infects bacteria
viroid
a small circular RNA molecule with a rod-like secondary structure; cannot encode for protein
virusoid
viroid-like molecules; satellites packaged into virus capsids
prion
a free flowing protein molecule
variolation
the process of injecting dry crust from recovering smallpox patients into a immunologically naive individual to generate protective immunity
attenuated virus
a less virulent virus that stimulates immune response and creates immunity but usually not the disease

in some cases once the mutated virus enters the human body reverse mutation occurs and the individual develops the disease
tropism
the tendency of a virus to favor replication in a specific set of tissues
viremia
the presence of virus in the blood
virus titer
a way of counting the number of viruses in the blood
virus-cell receptor interaction
viruses attaching to a protein molecule on the surface of a cell
herd immunity
state of a population in which immune individuals prevent the spread of disease