Attachment interference See interference

attachment proteins The protein(s) on a virus which attach to the cell receptor in the initial stage of infection.

attack rate In epidemiology, the number of cases of a disease incident to a defined population over a defined time period. Also called 'disease incidence'.

attenuated virus strains Mutant strains with low virulence or which are avirulent for their natural host species, and in which they can thus be used as a vaccine. Often obtained by passage in cell culture or in a host different from the one in which they usually cause disease.

attenuation The process of producing an attenuated virus strain.

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