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Quantitative Microbial Risk Assessment Combined With Hydrodynamic Modelling To Estimate The Public Health Risk Associated With Bathing After Rainfall Events | 41444
ISSN: 2161-0711

Journal of Community Medicine & Health Education
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Quantitative microbial risk assessment combined with hydrodynamic modelling to estimate the public health risk associated with bathing after rainfall events

World Congress on Public Health and Nutrition

Fasil Ejigu Eregno, Ingun Tryland, Torulv Tjomsland, Mette Myrmel, Lucy Robertson and Arve Heistad

Norwegian University of Life Sciences (NMBU), Norway

Posters & Accepted Abstracts: J Community Med Health Educ

DOI: 10.4172/2161-0711.C1.019

Abstract
This study investigated the public health risk from exposure to infectious microorganisms at Sandvika recreational beaches, Norway and dose-response relationships by combining hydrodynamic modelling with Quantitative Microbial Risk Assessment (QMRA) framework. Meteorological and hydrological data were collected to produce a calibrated hydrodynamic model using Escherichia coli as an indicator of faecal contamination. Based on average concentrations of reference pathogens (norovirus, Campylobacter, Salmonella, Giardia and Cryptosporidium) relative to E. coli in Norwegian sewage from previous studies, the hydrodynamic model was used for simulating the concentrations of pathogens at the local beaches during and after a heavy rainfall event, using three different decay rates. The simulated concentrations were used as input for QMRA and the public health risk was estimated as probability of infection from a single exposure of bathers during the three consecutive days after the rainfall event. The level of risk on the first day after the rainfall event was acceptable for the bacterial and parasitic reference pathogens, but high for the viral reference pathogen at all beaches, and severe at Kalvøya-small and Kalvøya-big beaches, supporting the advice of avoiding swimming in the day(s) after heavy rainfall. The study demonstrates the potential of combining discharge-based hydrodynamic modelling with QMRA in the context of bathing water as a tool to evaluate public health risk and support beach management decisions.
Biography

Email: fasil.eregno@nmbu.no

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