In lower concentrations, eugenol can act as a contact allergen evoking a localized delayed hypersensitivity reaction
Antigen-dependent macrophage migration inhibition (MI) was the first assay proposed as an in vitro correlate of delayed hypersensitivity reaction
 which is induced by lymphocytes
To determine whether delayed hypersensitivity reaction
to foods might be a factor in the development of chronic diarrhea in children, researchers measured IgG antibodies and prescribed an elimination diet to children in four different groups.
Delayed hypersensitivity reaction
to topical aminoglycosides in patients undergoing middle ear surgery.