Definition: Denoting the virulence of a virus capable of inducing lethal infection in embryonic hosts after a long incubation period and an inapparent infection in immature and adult hosts; the term is used in characterizing Newcastle disease virus, particularly strains used as vaccines administered in water or as sprays, mild or avirulent strains.
[L. lentus, sluggish, inactive, + G. -gen, producing]
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