title: Legionella pneumophila serogroup 3 infection: importance of serology.
abstract: We present a case of Legionella pneumophila serogroup 3 (LP3) infection in a patient with severe community-acquired pneumonia (CAP). The diagnosis was complicated by an initial equivocal L. pneumophila urinary antigen test, followed by two negative samples. LP3 was cultured from a sputum sample and the diagnosis was confirmed by serology 15 days into the admission. This case highlights the importance of considering non-LP1 serogroups as causes of CAP and the role of serological testing in diagnosis.
authors.affiliation: Department of Bacteriology, Southern General Hospital, Glasgow, Scotland, UK. nitish.khanna@nhs.net
authors.forename: N
authors.initials: N
authors.lastname: Khanna
authors.forename: A
authors.initials: A
authors.lastname: Meikle
authors.forename: L
authors.initials: L
authors.lastname: Gillespie
authors.forename: G
authors.initials: G
authors.lastname: Edwards
authors.forename: D
authors.initials: D
authors.lastname: Lindsay
mesh_terms: D000900:Anti-Bacterial Agents / Q000008:administration & dosage*; D017714:Community-Acquired Infections / Q000175:diagnosis* / Q000188:drug therapy / Q000276:immunology; D006801:Humans; D016952:Legionella pneumophila / Q000145:classification / Q000302:isolation & purification*; D007877:Legionnaires' Disease / Q000175:diagnosis* / Q000188:drug therapy / Q000276:immunology; D008297:Male; D000077731:Meropenem; D008875:Middle Aged; D012698:Serologic Tests; D013183:Sputum / Q000276:immunology*; D013845:Thienamycins / Q000008:administration & dosage*; D016896:Treatment Outcome
chemical_list: D000900:Anti-Bacterial Agents; D013845:Thienamycins; D000077731:Meropenem