Any immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat.

biological_process

GO:0006955

http://purl.obolibrary.org/obo/uberon.owl, http://purl.obolibrary.org/obo/go.owl, http://purl.obolibrary.org/obo/cl.owl

• regulation of immune response

• positive regulation of immune response

• negative regulation of immune response

• cell activation involved in immune response