**The [[Immunoglobulins|antibodies]] are used in combination with Antigen Recognition|antigen (and often an [[Vaccines#Adjuvants|adjuvant]]) which is injected into the host animal | **The [[Immunoglobulins|antibodies]] are used in combination with Antigen Recognition|antigen (and often an [[Vaccines#Adjuvants|adjuvant]]) which is injected into the host animal |