Distribution and persistence of fecal bacterial populations in liquid and dewatered sludge from a biological treatment plant

Vilanova, X; Blanch, Anicet R.

doi:10.2323/jgam.51.361

Cited by 16 publications

(15 citation statements)

References 36 publications

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“…This result was slightly different from that of previous detailed studies of sewage isolates where E. faecalis and E. faecium were present in more equal frequencies (Pinto et al. 1999; Vilanova and Blanch 2005). The overall frequency of initial false positive mEI results was similar to that of earlier studies which reported a false positive rate of 6% (Messer and Dufour 1998).…”

Section: Discussioncontrasting

confidence: 99%

“…Several studies have utilized enrichment or selection media containing vancomycin to increase the sensitivity of detection of resistant strains. The low levels of VRE that can be detected utilizing these techniques (0·01% of Enterococcus isolates) (Vilanova and Blanch 2005) could not be detected in this study. This indicates that while VRE was not detected in this study, and is not present in high concentrations in the samples examined, it may however, be present in a low frequency that will require further, more focused, studies to detect.…”

Section: Discussioncontrasting

confidence: 62%

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Species distribution and antimicrobial resistance of enterococci isolated from surface and ocean water

Moore¹,

Guzman²,

McGee

2008

Journal of Applied Microbiology

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Aims: The species identification and antimicrobial resistance profiles were determined for enterococci isolated from Southern California surface and ocean waters. Methods and Results: Species identification was determined for 1413 presumptive Enterococcus isolates from urban runoff, bay, ocean and sewage water samples. The most frequently isolated species were Enterococcus faecalis, Enterococcus faecium, Enterococcus hirae, Enterococcus casseliflavus and Enterococcus mundtii. All five of these species were isolated from ocean and bay water with a frequency ranging from 7% to 36%. Enterococcus casseliflavus was the most frequently isolated species in urban runoff making up 36–65% of isolates while E. faecium was the most frequently isolated species in sewage making up 53–78% of isolates. The similar distribution of species in urban runoff and receiving water suggests that urban runoff may be the source of Enterococcus. No vancomycin or high level gentamycin resistance was detected in E. faecalis and E. faecium isolates. Conclusions: Enterococcus faecalis, E. faecium, E. casseliflavus and E. mundtii are the most commonly isolated Enterococcus species from urban runoff and receiving waters in Southern California. Significance and Impact of the Study: Determination of the Enterococcus species isolated from receiving waters and potential pollution sources may assist in determining the sources of pollution.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussioncontrasting

confidence: 62%

Species distribution and antimicrobial resistance of enterococci isolated from surface and ocean water

Moore¹,

Guzman²,

McGee

2008

Journal of Applied Microbiology

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“…Pathogenic and antibioticresistant microorganisms in WWTP effluents are a growing public health concern (George et al, 2002;Reinrhaler et al, 2003). Multiple antibiotic resistant fecal coliforms and enterococci including vancomycin resistant Enterococcus (VRE) have been detected in influent, effluent, and sludge from municipal wastewater treatment plants (Blanch et al, 2003;Caplin, et al, 2008;da Costa et al, 2006;Fars et al, 2005;Telabi et al, 2007;Vilanova and Blanch, 2005;Xu et al, 2007). The WWTPs provide a favorable environment for gene transfer because of high bacterial densities and nutritionally rich influent (da Costa et al, 2006;Silva, 2006;Xu et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Freezing Inactivation of Escherichia Coli and Enterococcus Faecalis in Water: Response of Different Strains

Gao¹,

Leung

Hawdon

2009

Water Environment Research

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The effect of freezing temperature (−7, −15, −30 and −80°C), number of freeze/thaw cycles (1 to 5 cycles) and sample volume (100 mL and 100 µL) on the viability of a pathogenic and an opportunistically pathogenic Escherichia Coli, a vancomycin‐resistant and a vancomycin‐sensitive Enterococcus Faecalis were examined. About 3.3 to 4.3 and 1.5 to 2.4 log reduction in cell density were observed in E. coli and E. faecalis, respectively, in the 100 mL samples frozen at −30°C or warmer. Freezing at −80°C was the least effective in killing the microbes, on average the log reduction at −80°C was approximately 1.0 to 1.5 units less than those achieved at the three warmer temperatures. Based on statistical analysis, cell inactivation levels achieved at −7, −15, or −30°C were not significantly different (P‐value = 0.1648). There were no statistical difference in terms of log reduction obtained under all experimental conditions for the two E.coli strains (P‐value = 0.46) and the two E. faecalis strains (P‐value = 0.10). The number of freezing/thaw cycles and sample volume, however, profoundly affected inactivation capacity of freezing. Freezing could be an effective method for further reduction of E. coli and Enterococcus in municipal wastewater/sludge.

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“…The microbial quality of a small, multiple-use reservoir in southern California was also investigated. Levels of TC showed FC that was one log higher than ENT and nearly two logs higher than spores of sulfate-reducing bacteria (Vilanova and Blanch, 2005). FC and ENT populations showed high diversity and similar population indices for all kinds of samples.…”

mentioning

confidence: 89%

Detection and Occurrence of Indicator Organisms and Pathogens

Stedtfeld¹,

Yurtsever²,

Duran³

et al. 2006

Water Environment Research

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Distribution and persistence of fecal bacterial populations in liquid and dewatered sludge from a biological treatment plant

Cited by 16 publications

References 36 publications

Species distribution and antimicrobial resistance of enterococci isolated from surface and ocean water

Species distribution and antimicrobial resistance of enterococci isolated from surface and ocean water

Freezing Inactivation of Escherichia Coli and Enterococcus Faecalis in Water: Response of Different Strains

Detection and Occurrence of Indicator Organisms and Pathogens

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