title: Under the Weather: Legionellosis and Meteorological Factors.
abstract: The incidence of legionellosis, caused by the bacteria Legionella which are commonly found in the environment, has been increasing in New Jersey (NJ) over the last decade. The majority of cases are sporadic with no known source of exposure. Meteorological factors may be associated with increases in legionellosis. Time series and case-crossover study designs were used to evaluate associations of legionellosis and meteorological factors (temperature (daily minimum, maximum, and mean), precipitation, dew point, relative humidity, sea level pressure, wind speed (daily maximum and mean), gust, and visibility). Time series analyses of multi-factor models indicated increases in monthly relative humidity and precipitation were positively associated with monthly legionellosis rate, while maximum temperature and visibility were inversely associated. Case-crossover analyses of multi-factor models indicated increases in relative humidity occurring likely before incubation period was positively associated, while sea level pressure and visibility, also likely preceding incubation period, were inversely associated. It is possible that meteorological factors, such as wet, humid weather with low barometric pressure, allow proliferation of Legionella in natural environments, increasing the rate of legionellosis.
authors.affiliation: Environmental and Occupational Health Surveillance Program, New Jersey Department of Health, 135 East State Street, P.O. Box 369, Trenton, NJ, 08625, USA. jessie.gleason@doh.state.nj.us.
authors.forename: Jessie A
authors.initials: JA
authors.lastname: Gleason
authors.affiliation: Communicable Disease Service, New Jersey Department of Health, Trenton, NJ, USA.
authors.forename: Natalie R
authors.initials: NR
authors.lastname: Kratz
authors.affiliation: Communicable Disease Service, New Jersey Department of Health, Trenton, NJ, USA.
authors.forename: Rebecca D
authors.initials: RD
authors.lastname: Greeley
authors.affiliation: Environmental and Occupational Health Surveillance Program, New Jersey Department of Health, 135 East State Street, P.O. Box 369, Trenton, NJ, 08625, USA.
authors.forename: Jerald A
authors.initials: JA
authors.lastname: Fagliano
mesh_terms: D018592:Cross-Over Studies; D006801:Humans; D006813:Humidity; D007876:Legionellosis / Q000453:epidemiology*; D008685:Meteorological Concepts; D009515:New Jersey; D013696:Temperature; D014887:Weather
keywords: Legionella; humidity; precipitation; sea level pressure; visibility; weather