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Synergistic effects of ozonation pretreatment and trace phosphate on water quality health risk and microbial stability in simulated drinking water distribution systems.
J Hazard Mater
December 2024
Institute of Environmental Research at Greater Bay, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China.
The proliferation and chlorine resistance of pathogenic bacteria in drinking water distribution systems (DWDSs) pose a serious threat to human health. In this study, the synergistic effects of ozonation pretreatment and trace phosphate on water quality health risk and microbial stability were investigated in the small-scale DWDSs simulated by biofilms annular reactors with cast iron coupons. The results indicated that ozonation of drinking water containing trace phosphate was equivalent to increasing microbial carbon and phosphorus sources, further leading to the rapid proliferation of opportunistic pathogens (OPs) in subsequent DWDSs.
View Article and Find Full Text PDFAmoeba community dynamics and assembly mechanisms in full-scale drinking water distribution networks under various disinfectant regimens.
Water Res
November 2024
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China. Electronic address:
Free-living amoebae (FLA) are prevalent in drinking water distribution networks (DWDNs), yet our understanding of FLA community dynamics and assembly mechanisms in DWDNs remains limited. This study characterized the occurrence patterns of amoeba communities and identified key factors influencing their assembly across four full-scale DWDNs in three Chinese cities, each utilizing different disinfectants (chlorine, chloramine, and chlorine dioxide). High-throughput sequencing of full-length 18S rRNA genes revealed highly diverse FLA communities and an array of rare FLA species in DWDNs.
View Article and Find Full Text PDFFirst report on the long-term viability of species in unpreserved environmental freshwater samples stored at room temperature.
J Water Health
November 2024
Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne 50923, Germany; Medical School, Department of Basic and Clinical Science, University of Nicosia, Nicosia 2417, Cyprus.
Article Synopsis
- The study investigates the long-term viability of an opportunistic amoeba species in freshwater samples from the Philippines after being stored for 3 years at room temperature.
- Samples were filtered and cultured, revealing a 33% positivity rate for the amoeba, with various genotypes identified across different regions (Luzon, Visayas, Mindanao).
- The findings suggest that unpreserved water samples can remain viable for extended periods, posing a potential health risk due to the increased likelihood of human and animal contamination.
The presence of yeasts and bacteria in free-living amoebae isolated from COVID-19 patients: concern for secondary infections.
Int J Environ Health Res
October 2024
Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
This study aimed to investigate the presence of SARS-CoV-2, yeasts, and bacteria in isolated free-living amoeba (FLA) from COVID-19 patients. Nasopharyngeal swabs ( = 60) were obtained from COVID-19 patients. After cultivation, morphological characterization, and RNA/DNA extraction, the presence of selected microorganisms was investigated.
View Article and Find Full Text PDF[A single-center study on the distribution and shifting trend of infectious keratitis pathogens from 2018 to 2022].
Zhonghua Yan Ke Za Zhi
October 2024
Eye Hospital of Shandong First Medical University (Shandong Eye Hospital), State Key Laboratory Cultivation Base, Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong First Medical University & Shandong Academy of Medical Sciences, School of Ophthalmology, Shandong First Medical University, Jinan 250021, China.
To investigate the pathogen species, composition, and distribution characteristics of infectious keratitis pathogens in Shandong Province and its surrounding areas. In this cross-sectional study, patients with keratitis who underwent corneal sampling and microbiological culture at the Shandong Eye Hospital from January 1, 2018 to December 31, 2022 were included. Under topical anesthesia, the edge of the lesion was scraped by an experienced physician.
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