Pathogens in Ornamental and Recreational Waters: A Risk Assessment Study

Session: Poster session

Maria Luisa Jordao, Department of Environmental Health, National Institute of Health Dr. Ricardo Jorge NIF 501427511, [email protected]
Joao Rodrigues, Department of Infectious Diseases, National Institute of Health, [email protected]
Patricia Morgado, Instituto Nacional de Saude Dr Ricardo Jorge, [email protected]
Joao Grossinho, Department of Environmental Health, National Institute of Health, [email protected]
Helena Rebelo, Department of Environmental Health, National Institute of Health, [email protected]
Isabel Nogueira, Instituto Superior Técnico, [email protected]

Abstract

Ornamental and recreational waters of easy access are quite attractive and can hide threats to human health. Here we evaluated, the microbiota of ornamental waters in a Lisbon park (1year) and the microbiota of two dams with nautical recreational activities and fluvial beach to assess the risk for human health. In the microbiota, we identified the faecal indicator bacterium, E.coli, and other potential human pathogens such as A.baumannii, Aeromonas, E.cloacae, K.pneumoniae, Pseudomonas and Raoutella. The identification of known healthcare associated infections agents such as K. pneumoniae, as well as species of Pseudomonas (P.fluorescens, P.putida and P.oryzihabitans) that recently have been identified as etiological agents in immunosuppressed individuals is of particular relevance. The same bacterial species were isolated from biofilm and water suggesting the existence of an equilibrium between planktonic and biofilm organized bacteria. The role played by biofilm assembly on the emergence of antibiotic resistance is still ongoing for the isolated bacteria, as well as the possible interaction between water chemical composition and bacteria isolates. Potential pathogens (biofilm or planktonic) represent a significant cause of acute bacterial infections mainly in specific populations (paediatric and geriatric). These results support a periodic control of ornamental water microbiota as a preventive meassure.

1. Keyword
biofilm

2. Keyword
microbiological studies

3. Keyword
assessments