noun. any heightened immune response to an antigen; an allergy

noun. extreme sensitivity

noun. pathological sensitivity

"Type I, immediate anaphylactic hypersensitivity is characterised by the production of IgE antibodies against foreign proteins (Platts-Mills 2002)."

hypersensitive  

hypersensitivity pneumonitis  

sensibility  sensitiveness  sensitivity  

anaphylactic  anaphylaxis  blocker  candidiasis  collapsibility  

allergy  anaphylaxis  considerateness  delicacy  empathy