pathogenicity phenotype gain of pathogenicity A phenotype where the ability of a pathogen, to produce an infectious disease in another organism is obtained (pathogenicity was absent and is now present). alaynecuzick 2018-05-04T12:45:12Z pathogen_host_interaction_phenotype For use in the annotation extension infective ability. Can only apply to changes in the pathogen. Note that this ability to cause pathogenicity is a feature of the pathogen. Therefore gain/loss of pathogenicity should never be dependent on changes to the host genotype, only on changes to the pathogen genotype. If you are annotating changes in disease presence or absence dependent on the changes to the host consider increased/decreased virulence phenotypes. qc_extension_only gain of disease causing ability