Application and refinement of the WHO risk framework for recreational waters in Sydney, Australia.

Local adaptation of the World Health Organisation (WHO) Farnham approach to managing pathogen risk in recreational waters was readily achieved given the extensive microbiological beach data for Sydney, and a clear understanding of applying the 'Annapolis Protocol' sanitary survey component to beach classification. Daily enterococci counts were predicted by rainfall (>10 mm in 24 h or >5 mm over 4-5 days), or by wind direction/speed, sunlight and tide during dry periods. Quantitative microbial risk assessment models (maximum risk exponential model for gastroenteritis and adenovirus exponential model for respiratory illness) fitted the United Kingdom epidemiological data and show potential for use. Flexibility in interpreting what is important for local conditions is essential, illustrated by replacing the general descriptions in the Farnham report with more ridged values for stormwater-impacted beaches. Hence, a user-friendly format for bather risk management, based on key environmental predictors of faecal pollution (such as rainfall, wind direction and tide) should largely replace the need for regular and costly microbiological testing; providing risk estimates in real time and allowing immediate control measures, such as signage or temporary beach closures. Ongoing testing resources should be directed to understanding the source(s) of faecal contamination, comparing enterococci/enteric virus survival under warm Australian conditions and spot checks for recalibration of environmental factors.

[1]  A. Wyn-Jones,et al.  The detection of small round-structured viruses in water and environmental materials. , 2000, Journal of virological methods.

[2]  Alan F. Blumberg,et al.  Modeling Fate of Pathogenic Organisms in Coastal Waters of Oahu, Hawaii , 1999 .

[3]  Charles P. Gerba,et al.  Waterborne adenovirus: A risk assessment , 1997 .

[4]  M. Carere,et al.  Bacteriological and virological quality of seawater bathing areas along the Tyrrhenian coast , 2001, International journal of environmental health research.

[5]  A. Donnison,et al.  Towards a mechanistic understanding of pond disinfection , 2000 .

[6]  Alfred P. Dufour,et al.  A marine recreational water quality criterion consistent with indicator concepts and , 1983 .

[7]  Marylynn V. Yates,et al.  Predicted Public Health Consequences of Body‐contact Recreation ON A POTABLE WATER RESERVOIR , 2002 .

[8]  Adam W. Olivieri,et al.  Discussion: “Predicted Public Health Consequences of Body‐contact Recreation on a Potable Water Reservoir” , 2003 .

[9]  J. Cooney,et al.  Coliphages and indicator bacteria in Boston Harbor, Massachusetts , 1999 .

[10]  Jed A. Fuhrman,et al.  Enteroviruses detected by reverse transcriptase polymerase chain reaction from the coastal waters of Santa Monica Bay, California: low correlation to bacterial indicator levels , 2001, Hydrobiologia.

[11]  A. Prüss,et al.  Derivation of numerical values for the World Health Organization guidelines for recreational waters. , 2004, Water research.

[12]  Ian L. Pepper,et al.  Detection of Giardia and Cryptosporidium in marine waters , 1995 .

[13]  D. Kay,et al.  Predicting likelihood of gastroenteritis from sea bathing: results from randomised exposure , 1994, The Lancet.

[14]  G. Nichols,et al.  Risk factors for sporadic giardiasis: a case-control study in southwestern England. , 2003, Emerging infectious diseases.

[15]  Angela C. Brown,et al.  Generation of enterococci bacteria in a coastal saltwater marsh and its impact on surf zone water quality. , 2001, Environmental science & technology.

[16]  F Jones,et al.  Marine waters contaminated with domestic sewage: nonenteric illnesses associated with bather exposure in the United Kingdom. , 1996, American journal of public health.

[17]  J. Rose,et al.  Quantitative Microbial Risk Assessment , 1999 .

[18]  A H Havelaar,et al.  The Beta Poisson Dose‐Response Model Is Not a Single‐Hit Model , 2000, Risk analysis : an official publication of the Society for Risk Analysis.

[19]  Mark D. Sobsey,et al.  Comparative survival of indicator viruses and enteric viruses in seawater and sediment , 1993 .

[20]  David Kay,et al.  An experimental health-related classification for marine waters , 1999 .

[21]  E. Dubois,et al.  Devenir des virus entériques en mer et influence des facteurs environnementaux , 1998 .

[22]  N J Ashbolt,et al.  Survival of fecal microorganisms in marine and freshwater sediments , 1995, Applied and environmental microbiology.

[23]  R. Davies‐Colley,et al.  Sunlight Inactivation of Fecal Indicator Bacteria and Bacteriophages from Waste Stabilization Pond Effluent in Fresh and Saline Waters , 2002, Applied and Environmental Microbiology.