Estimating 95th Percentiles from Microbial Sampling: A Novel Approach to Standardising their Application to Recreational Waters

Lugg, Richard; Cook, Angus; Devine, Brian

doi:10.1039/9781849735421-00062

Cited by 1 publication

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the description of Lugg et al (2012) and our experience with Enterotester (V6771), its assessment algorithm for determination of MACs is summarized in the flowchart of Fig. 1.…”

Section: Implementation Of the Mac Assessment Criteria In Enterotestementioning

confidence: 99%

“…Enterotester uses the Microsoft Excel spreadsheet as the analysis platform and its stated purpose is to enable the practical application of chapter five of the Guidelines (Lugg et al 2012;UWA 2007). Enterotester's major analysis outputs include: number of observations, estimated GI illness risk, assigned or standardized 95 th percentile, microbial water quality assessment category, the suggested one-off water quality trigger level, and the suggested water quality two-in-a-row trigger level.…”

Section: Fig 1: the Enterotester Algorithm For Determination Of The mentioning

confidence: 99%

“…In addition, a recurring criticism of the Guidelines, as with the WHO (2003) guidelines, is that they make no recommendation for trigger levels based on enterococci data for the actions taken under exceptional circumstances. In response to these concerns, Lugg et al developed a now widely used spreadsheet-based analysis tool 'Enterotester' to enable the practical application of chapter five of the Guidelines (Lugg et al 2012;UWA 2007). With a completely different raw data treatment procedure and assessment algorithm, EnterosisA provides similar functionality to Enterotester.…”

Section: Introductionmentioning

confidence: 99%

“…As described by Lugg et al (2012), Enterotester's assessment algorithm uses the excess GI illness risk as the assessment criterion in determination of MACs. The standardized 95 th percentile value is only a enterococci CFU score derived from the estimated health risk probability and it does not really play a role in determination of MACs.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

EnterosisA: A Statistical Decision Support Tool for Categorization of Microbial Quality of Recreational Water

Xie

Mengersen

Cleary

et al. 2014

Water Qual Expo Health

View full text Add to dashboard Cite

The 95 th percentile of numbers of intestinal enterococci per 100 mL, associated with estimated health risk, are used for determination of the microbial assessment category (MAC) in the National Guidelines for Managing Risks in Recreational Water published by the Australian National Health and Medical Research Council in 2008. A statistical decision support tool was developed to facilitate the analysis of microbial water quality data for the purposes of classifying recreational waterways in southeast Queensland, Australia. This analysis tool, named 'EnterosisA', classifies MACs based on an assessment criterion which takes account of both the calculated 95th enterococci percentile values from empirical data and the associated gastrointestinal (GI) illness risk. EnterosisA provides similar functionality to the widely used analysis tool 'Enterotester', but is distinguished by a completely different procedure for raw data treatment and by its assessment algorithm. Using enterococci data collected from 88 recreational water sites over the period 2010 to 2013, the MAC assessment results were compared between Enterotester and EnterosisA. The comparison showed that EnterosisA matched Enterotester MAC results in 86.3% cases, with 11.4% over-categorized (overcategorization equates to higher levels of estimated health risk) and 2.3% under-categorized cases. EnterosisA followed a conservative approach to allocate MACs and aimed to minimize the need for user's intervention in obtaining the assessment results. Without the involvement of hypothesis testing in the assessment procedure and with a one-click-for-answer design, the EnterosisA is much easier to use. Measured in the raw concentration data scale instead of the standardized distribution scale, the trigger levels estimated by EnterosisA are assumed to be more relevant for recreational water management decision-making. The EnterosisA is shown to be a valid, alternative analysis tool in the implementation of the recreational water management guidelines through classifying the microbial water quality of water bodies. This research provides valuable empirical evidence for future revisions of the guidelines.

show abstract

“…Based on the description of Lugg et al (2012) and our experience with Enterotester (V6771), its assessment algorithm for determination of MACs is summarized in the flowchart of Fig. 1.…”

Section: Implementation Of the Mac Assessment Criteria In Enterotestementioning

confidence: 99%

Section: Fig 1: the Enterotester Algorithm For Determination Of The mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

EnterosisA: A Statistical Decision Support Tool for Categorization of Microbial Quality of Recreational Water

Xie

Mengersen

Cleary

et al. 2014

Water Qual Expo Health

View full text Add to dashboard Cite

show abstract

Estimating 95th Percentiles from Microbial Sampling: A Novel Approach to Standardising their Application to Recreational Waters

Cited by 1 publication

References 0 publications

EnterosisA: A Statistical Decision Support Tool for Categorization of Microbial Quality of Recreational Water

EnterosisA: A Statistical Decision Support Tool for Categorization of Microbial Quality of Recreational Water

Contact Info

Product

Resources

About