obsolete induction by symbiont of host catalytic activity https://github.com/geneontology/go-ontology/issues/21740 true OBSOLETE. Any process in which the symbiont activates, maintains or increases the frequency, rate or extent of host enzyme activity. The host is defined as the larger of the organisms involved in a symbiotic interaction. up regulation by symbiont of host enzyme activity biological_process activation by symbiont of host enzyme activity GO:0043948 up-regulation by symbiont of host enzyme activity upregulation by symbiont of host enzyme activity activation of host enzyme activity positive regulation by symbiont of host catalytic activity positive regulation by symbiont of host enzyme activity This term was obsoleted because it represents a molecular function.