title: Delayed seroconversion, Legionnaires' disease, and age.
mesh_terms: D000367:Age Factors; D000368:Aged; D000907:Antibodies, Bacterial / Q000032:analysis*; D006801:Humans; D007875:Legionella / Q000276:immunology; D007877:Legionnaires' Disease / Q000276:immunology*; D008875:Middle Aged; D013997:Time Factors
chemical_list: D000907:Antibodies, Bacterial