title: How does the external eye resist infection.
mesh_terms: D002690:Chlamydia Infections / Q000276:immunology; D003228:Conjunctiva / Q000276:immunology*; D003315:Cornea / Q000276:immunology*; D006801:Humans; D007109:Immunity; D007111:Immunity, Cellular; D007070:Immunoglobulin A / Q000096:biosynthesis; D007372:Interferons / Q000276:immunology; D007635:Keratitis, Dendritic / Q000276:immunology; D009092:Mucous Membrane / Q000276:immunology; D010587:Phagocytosis; D013666:Tears / Q000276:immunology
chemical_list: D007070:Immunoglobulin A; D007372:Interferons