The series of events in which a stimulus from a symbiont (an organism living in close physical association with an organism of a different species) is received and converted into a molecular signal. The symbiont is defined as the smaller of the organisms involved in a symbiotic interaction.
formation by host of specialized structure for nutrient acquisition from symbiont
host response to induction by symbiont of tumor, nodule or growth in host
killing by host of symbiont cells +
lectin-induced modified bacterial internalization
modulation by host of symbiont process +
reorganization of cellular membranes to establish viral sites of replication