Relative survival of Escherichia coli and Salmonella typhimurium in a tropical estuary

Abstract

Microcosm studies have been carried out to find out the relative survival of Escherichia coli and Salmonella typhimurium in a tropical estuary. Survival has been assessed in relation to the important self-purifying parameters such as biotic factors contained in the estuarine water, toxicity due to the dissolved organic and antibiotic substances in the water and the sunlight. The results revealed that sunlight is the most important inactivating factor on the survival of E. coli and S. typhimurium in the estuarine water. While the biological factors contained in the estuarine water such as protozoans and bacteriophages also exerted considerable inactivation of these organisms, the composition of the water with all its dissolved organic and inorganic substances was not damaging to the test organisms. Results also indicated better survival capacity of E. coli cells under all test conditions when compared to S. typhimurium.

Detection of Human-Derived Fecal Pollution in Environmental Waters by Use of a PCR-Based Human Polyomavirus Assay

“…(16S rRNA Bacteroides marker) are obligately anaerobic bacteria, and HPyVs are double-stranded DNA viruses. It has been documented that the indicator organisms, as well as aerotolerant bacteria, obligately anaerobic bacteria, and viruses, are susceptible to environmental stresses (e.g., UV radiation, temperature, and salinity) to various degrees (3,15,36,38,48,54). Further study will be necessary to determine the dominant factors that influence the persistence and detection of these organisms in environmental waters.…”

Predicting Salmonella Populations from Biological, Chemical, and Physical Indicators in Florida Surface Waters

“…Contradictory results have been reported as to the efficacy of index or indicator organisms in predicting the presence and/or prevalence of human pathogens, such as Salmonella, in surface waters (16)(17)(18)(19). While any specific pathogen may not be present in the sample being tested, the presence of index microorganisms is meant to suggest that pathogens have a reasonable likelihood of being present (1).…”

Étude de l’influence des facteurs environnementaux sur la distribution de différentes populations bactériennes dans une station mytilicole de la lagune de Bizerte (Nord-Tunisie)

“…Des résultats similaires ont été obtenus par ASLAN-YILMAZ et al (2004), CHANDRAN et HATHA (2005), DAVIES-COLLEY et al (1994) et SINTON et al (2002. Ces auteurs ont montré que l'augmentation en température pendant la saison estivale inactiverait les polluants fécaux.…”