Health Risks to Communities and Athletes Associated with Swimming, Wading, and Sailing in Water Bodies of Brazil’s Guanabara Bay Basin
Author:
Sklar Rachel1ORCID, Chabrelie Alexander E.2, Carreira Renato S.3ORCID, Gurian Patrick L.4ORCID, Mitchell Jade2ORCID
Affiliation:
1. Program for Reproductive Health and Environment, University of California, San Francisco, CA 94143, USA 2. Department of Biosystems Agricultural Engineering, Michigan State University, East Lansing, MI 48824, USA 3. Department of Chemistry, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro 22451-900, Brazil 4. Department of Civil, Architectural and Environmental Engineering Department, Drexel University, Philadelphia, PA 19104, USA
Abstract
Guanabara Bay has been known to be polluted with trash and sewage from the surrounding areas, but health risks from recreational contact with water in the basin have not been well characterized. In this paper, fecal indicator bacteria (FIB) monitoring data are used to predict risks in three different exposure scenarios: (1) bathing in freshwater rivers that discharge into Guanabara Bay, (2) wading in these freshwater rivers, and (3) sailing in Guanabara Bay. Concentrations of indicator bacteria in river samples were measured directly, and concentrations of indicator bacteria in bay samples were sourced from publicly available government data sets. Ratios between pathogens and fecal indicator concentrations were used to estimate risks for five selected pathogens based on the indicator concentrations. The median risk of disease estimated from E. coli indicator concentrations was 1.0, 9.9 × 10−1 and 8.2 × 10−4 for the swimming, wading, and sailing exposure pathways, respectively. Risks estimates based on concentrations of the enterococci indicator bacteria in the sailing exposure scenario were comparable, at 3.4 × 10−4. The sum of total risk estimated from the five selected pathogens was 5.9 × 10−1, 3.6 × 10−1, and 1.0 × 10−3 for the swimming, wading, and sailing exposure pathways, respectively. Estimated risks of swimming and wading in the rivers far exceeded risks associated with U.S. recreational contact standards, while estimated risks for sailing in the bay were well below these risk guidelines. The 95th percentile of the sailing risk was estimated to exceed the U.S. recreational contact risk level. This paper exemplifies an approach to conducting quantitative microbial risk assessments when only fecal indicator bacteria data are available. Context-specific data on the relevant exposure routes, exposure frequency, and site-specific indicator: pathogen ratios were lacking, which ultimately led to uncertainty in the model. This study is intended to provide a framework for estimating GI risk based on fecal indicator concentrations while acknowledging that the substantial variation in indicator:pathogen ratios make the results of such efforts uncertain.
Funder
Indo-U.S. 21st Century Knowledge Program
Subject
Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry
Reference47 articles.
1. Environmental and sanitary conditions of Guanabara Bay, Rio de Janeiro;Fistarol;Front. Microbiol.,2015 2. (2016, June 21). CDC Healthy Swimming—Diarrheal Illness, Available online: http://www.cdc.gov/healthywater/swimming/swimmers/rwi/diarrheal-illness.html. 3. Dufour, A., Cabelli, V., Ericksen, T., Ballantine, R., Goldberg, M., and Fox, W. (1986). Bacteriological Ambient Water Quality Criteria for Marine and Fresh Recreational Waters, United States Environmental Protection Agency. 4. Korajkic, A., McMinn, B.R., and Harwood, V.J. (2018). Relationships between Microbial Indicators and Pathogens in Recreational Water Settings. Int. J. Environ. Res. Public Health, 15. 5. (2006). Directive 2006/7/EC of the European Parliament and of the Council of 15 February 2006 concerning the management of bathing water quality and repealing Directive 76/160/EEC. Off. J. Eur. Union, 64, 37–51.
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