I

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IgA deficiency (selective)	Inherited disorders
IgG subclass deficiency	Insect sting sensitivity
Immunodeficiency	Insecticide exposure, poisoning
Immunoproliferative disorders	Interstitial lung disease
Impotence/loss of libido (male)	Intra-uterine growth retardation
Incompatible blood transfusion	Iritis (uveitis)
Infection (increased susceptibility)	Iron deficiency
Infectious mononucleosis	Iron toxicity
Infertility	Ischaemic heart disease
Inflammatory bowel disease	Itch
Influenza