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Variations in microbial indicator densities in beach waters and health-related assessment of bathing water quality

Published online by Cambridge University Press:  15 May 2009

W. H. S. Cheung ,
K. C. K. Chang  and
R. P. S. Hung
W. H. S. Cheung
Affiliation:
Environmental Protection Department, 28/F., Southorn Centre, Wanchai, Hong Kong
K. C. K. Chang
Affiliation:
Environmental Protection Department, 28/F., Southorn Centre, Wanchai, Hong Kong
R. P. S. Hung
Affiliation:
Environmental Protection Department, 28/F., Southorn Centre, Wanchai, Hong Kong
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Daily and hourly variations in microbial indicators densities in the beach-waters of Hong Kong have been described. The levels of Escherichia coli at a number of beaches was observed to be influenced by tide, and for staphylococci, by bather numbers. The tidal influence was most obvious during spring tides; and for the effect of bathers, during neap tides. Both organisms are present in high densities in external sources of faecal pollution of bathing beaches, with the average staphylococci to E. coli ratios being 0·04–3. Staphylococci may serve as an indicator of bather density and the risk of cross-infection amongst bathers (rather than as another indicator of faecal contamination) when the average staphylococci to E. coli ratio for a bathing beach is considerably higher than 3. The variability of microbial indicator densities means the routine sampling of bathing beaches should be carried out on weekend days with maximum numbers of swimmers exposed to the water, and spread throughout the bathing season.

Type
Special Article
Information
Epidemiology & Infection , Volume 106 , Issue 2 , April 1991 , pp. 329 - 344
Copyright
Copyright © Cambridge University Press 1991

References

REFERENCES

1.Cabelli, VJ, Dufour, AP, McCabe, LJ, Levin, MA. Swimming-associated gastroenteritis and water quality. Am J Epidemiol 1982; 115: 606–16.CrossRefGoogle ScholarPubMed
2.Dufour, AP. Bacterial indicators of recreational water quality. Can J Public Health 1984; 75: 49–56.Google ScholarPubMed
3.Seyfried, PL, Tobin, RS, Brown, NE, Ness, PF. A prospective study of swimming-related illness. II. Morbidity and the microbiological quality of water. Am J Public Health 1985; 75: 1071–5.CrossRefGoogle ScholarPubMed
4.Cheung, WHS, Chang, KCK, Hung, RPS, Kleevens, JWL. Health effects of beach-water pollution in Hong Kong. Epidemiol Infect 1990; 105: 139–62.CrossRefGoogle ScholarPubMed
5.Foster, DH, Hanes, BN, Lord, SM. A critical examination of bathing water quality standards. J Water Poll Control Fed 1971; 43: 2229–41.Google ScholarPubMed
6.Brenniman, GR, Rosenberg, SH, Northrop, RL. Microbial sampling variables and recreational water quality standards. Am J Public Health 1981; 71: 283–9.CrossRefGoogle ScholarPubMed
7.Fleisher, JM. Implications of coliform variability in the assessment of the sanitary quality of recreational waters. J Hyg 1985; 94: 193–200.CrossRefGoogle ScholarPubMed
8.Cheung, WHS, Ha, DKK, Yeung, KY, Hung, RPS. Methods for enumerating Escherichia coli in subtropical waters. Epidemiol Infect 1991; 106: 345–354.CrossRefGoogle ScholarPubMed
9.Royal Observatory, Hong Kong. Tide tables for Hong Kong, 1987. Hong Kong: Government Printer, 1986.Google Scholar
10.Cheung, WHS, Chang, KCK. Microbiological water quality of bathing beaches in Hong Kong, 1988. Environmental Protection Department, Hong Kong Government, EPD/TR5/88. Hong Kong: Government Printer, 1989.Google Scholar
11.Cheung, WHS. Microbiological tracer studies in Tuen Mun waters. Environmental Protection Department, Hong Kong Government, 1987. EPD/TP6/87.Google Scholar
12.Robinton, ED, Mood, EW. A quantitative and qualitative appraisal of microbial pollution of water by swimmers: a preliminary report. J Hyg 1966; 64: 489–99.Google ScholarPubMed
13.Favero, MS. Microbiological indicators of health risks associated with swimming. Am J Public Health 1985; 75: 1051–4.CrossRefGoogle ScholarPubMed
14.Fattal, B, Peleg-Olevsky, E, Yoshpe-Purer, Y, Shuval, HI. The association between morbidity among bathers and microbial quality of seawater. Wat Sci Tech 1986; 18: 59–69.CrossRefGoogle Scholar
15.European Economic Community. Council Directive of 8 December 1975 concerning the quality of bathing water. Official Journal of the European Communities No L31/1–4, 1976. 76/160/EEC.Google Scholar
16.World Health Organisation/United Nations Environment Programme. Health criteria and epidemiological studies related to coastal water pollution. Copenhagen: WHO Regional Office for Europe, 1977.Google Scholar
17.United Nations Environment Programme/World Health Organisation. Assessment of the present state of microbial pollution in the Mediterranean sea and proposed control measures. Geneva: UNEP, 1985.Google Scholar
18.United States Environmental Protection Agency. Ambient water quality criteria for bacteria – 1986. US Environmental Protection Agency, 1986. EPA-440/5–84–002.Google Scholar