Abstract
When influenza virus monoclonal antibody-resistant (mar) mutants are selected by incubation in vitro with excess antibody, 90 to 99% of the mutants are not detectable. This observation may be explained by encapsidation of mar mutant RNAs within phenotypically wild-type envelopes. This phenotypic hiding can be revealed by selection of mar mutants in vivo after virus uncoating. Using experimental procedures appropriate to detect all viable mar mutants in a virus population, we determined precisely the mutation rates to the mar genotype by the fluctuation test for two nonoverlapping monoclonal antibodies.
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