Subtypes of Legionella pneumophila serogroup 1 associated with different attack rates. 1983

J F Plouffe, and M F Para, and W E Maher, and B Hackman, and L Webster

From January, 1982, through February, 1983, 20 cases of nosocomial legionnaires' disease caused by Legionella pneumophila serogroup 1 were identified in two adjoining hospital buildings, UH and RH. Although the buildings housed similar patient populations and the hot water systems in each were colonised with similar numbers of L pneumophila serogroup 1, 19 cases (1.03/1000 discharges) occurred in UH and only 1 case (0.08/1000 discharges) occurred in RH. Three subtypes of L pneumophila serogroup 1 were defined by plasmid content and monoclonal antibody binding patterns; two were unique to the environmental and patient isolates from UH and one was unique to RH. The marked differences in the attack rates suggest that the UH subtypes may be more pathogenic than the RH subtype and that the subtyping of L pneumophila might be a useful tool for studying the epidemiology of legionnaires' disease.

UI MeSH Term Description Entries
D007875 Legionella Gram-negative aerobic rods, isolated from surface water or thermally polluted lakes or streams. Member are pathogenic for man. Legionella pneumophila is the causative agent for LEGIONNAIRES' DISEASE.
D007877 Legionnaires' Disease An acute, sometimes fatal, pneumonia-like bacterial infection characterized by high fever, malaise, muscle aches, respiratory disorders and headache. It is named for an outbreak at the 1976 Philadelphia convention of the American Legion. Legionella pneumophila Infections,Infections, Legionella pneumophila,Legionnaire Disease,Pontiac Fever,Disease, Legionnaire,Disease, Legionnaires',Fever, Pontiac,Infection, Legionella pneumophila,Legionella pneumophila Infection,Legionnaire's Disease,Legionnaires Disease
D003428 Cross Infection Any infection which a patient contracts in a health-care institution. Hospital Infections,Nosocomial Infections,Health Care Associated Infection,Health Care Associated Infections,Healthcare Associated Infections,Infection, Cross,Infections, Hospital,Infections, Nosocomial,Cross Infections,Healthcare Associated Infection,Hospital Infection,Infection, Healthcare Associated,Infection, Hospital,Infection, Nosocomial,Infections, Cross,Infections, Healthcare Associated,Nosocomial Infection
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D014871 Water Microbiology The presence of bacteria, viruses, and fungi in water. This term is not restricted to pathogenic organisms. Microbiology, Water
D014881 Water Supply Means or process of supplying water (as for a community) usually including reservoirs, tunnels, and pipelines and often the watershed from which the water is ultimately drawn. (Webster, 3d ed) Supplies, Water,Supply, Water,Water Supplies

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