Impact of environmental factors and climate conditions on the occurrence of Vibrio and Shewanella infections in Norway, 2014–2018
摘要
Vibrio and Shewanella spp. (VS) are climate-sensitive bacteria found in marine environments, which sometimes cause severe human infections. VS infections have risen globally, particularly in Northern Europe. In this study, we aimed to describe the epidemiology of VS infections in Norway and to explore marine environmental factors and climate conditions as predictors for public health responses.
MethodsWe conducted a retrospective cross-sectional study of VS infections reported in Norway from 2014 to 2018. Epidemiological data were collected through a nationwide survey of public health microbiology laboratories. Environmental data, including seawater temperature (SWT), salinity (SWS), atmospheric temperature (AT), and rainfall (RF), were obtained from Norwegian public monitoring systems. Negative binomial regression adapted for time-series data was used to estimate the short-term effect of marine environmental factors and climate conditions on the number of VS cases.
ResultsA total of 303 VS infections were reported with most cases (63%) occurring in the Southeast region of Norway. SWT, SWS, and AT showed significant correlations with VS cases, with a gradual non-linear increase in VS risk for seawater temperature above 13°C [RR 1.60; CI(95%):1.02,2.8]. A 1-month lag effect was observed with increased SWT and AT predicting VS cases. No significant association was found for RF at the national level, but regional differences were observed.
ConclusionsVS infections in Norway are influenced by marine environmental factors and climate conditions. Validation of existing real-time models adapted to the regional conditions could enhance early public health responses to inform preventive measures for the at-risk population in Norway.