biological process involved in symbiotic interaction symbiosis, encompassing mutualism through parasitism biological process involved in interaction with host interaction with host An interaction between two organisms living together in more or less intimate association. The term host is used for the larger (macro) of the two members of a symbiosis; the various forms of symbiosis include parasitism, commensalism and mutualism. GO:0051701 growth of symbiont in host cell Reactome:R-HSA-9635486 Reactome:R-HSA-9658195 biological_process growth of symbiont in host GO:0044125 GO:0044112 GO:0044123 growth of symbiont in host organelle GO:0044121 GO:0044119 growth of symbiont in host vacuole GO:0044117 GO:0044116