title: Booster effect of histoplasmin skin testing in an elderly population.
mesh_terms: D000367:Age Factors; D000368:Aged; D002825:Chorioretinitis / Q000453:epidemiology / Q000209:etiology; D005260:Female; D006659:Histoplasmin; D006660:Histoplasmosis / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology / Q000276:immunology; D006801:Humans; D007111:Immunity, Cellular; D007117:Immunization, Secondary; D008297:Male; D008396:Maryland; D008875:Middle Aged; D012882:Skin Tests; D013997:Time Factors
chemical_list: D006659:Histoplasmin