normal pathogen growth after penetration of the barrier pathogen_phenotype alaynecuzick single_species_phenotype normal pathogen post penetration 2018-05-04T13:19:13Z A single species phenotype in which the pathogen's ability to contine to grow after penetration of a given experimental substance/membrane in an in vitro assay is normal (i.e indistinguishable from wild type). pathogen penetration across barrier phenotype