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SARS-CoV-2 RNA surveillance in large to small centralized wastewater treatment plants preceding the third COVID-19 resurgence in Bangkok, Thailand.
Sangsanont, Jatuwat; Rattanakul, Surapong; Kongprajug, Akechai; Chyerochana, Natcha; Sresung, Montakarn; Sriporatana, Nonnarit; Wanlapakorn, Nasamon; Poovorawan, Yong; Mongkolsuk, Skorn; Sirikanchana, Kwanrawee.
  • Sangsanont J; Department of Environmental Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; Water Science and Technology for Sustainable Environmental Research Group, Chulalongkorn University, Bangkok 10330, Thailand.
  • Rattanakul S; Department of Environmental Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand.
  • Kongprajug A; Research Laboratory of Biotechnology, Chulabhorn Research Institute, Bangkok 10210, Thailand.
  • Chyerochana N; Research Laboratory of Biotechnology, Chulabhorn Research Institute, Bangkok 10210, Thailand.
  • Sresung M; Research Laboratory of Biotechnology, Chulabhorn Research Institute, Bangkok 10210, Thailand.
  • Sriporatana N; Department of Environmental Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
  • Wanlapakorn N; Center of Excellence in Clinical Virology, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Thailand.
  • Poovorawan Y; Center of Excellence in Clinical Virology, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Thailand.
  • Mongkolsuk S; Research Laboratory of Biotechnology, Chulabhorn Research Institute, Bangkok 10210, Thailand; Center of Excellence on Environmental Health and Toxicology (EHT), Ministry of Education, Bangkok 10400, Thailand.
  • Sirikanchana K; Research Laboratory of Biotechnology, Chulabhorn Research Institute, Bangkok 10210, Thailand; Center of Excellence on Environmental Health and Toxicology (EHT), Ministry of Education, Bangkok 10400, Thailand. Electronic address: kwanrawee@cri.or.th.
Sci Total Environ ; 809: 151169, 2022 Feb 25.
Article in English | MEDLINE | ID: covidwho-1475056
ABSTRACT
Wastewater surveillance for SARS-CoV-2 RNA has been a successful indicator of COVID-19 outbreaks in populations prior to clinical testing. However, this has been mostly conducted in high-income countries, which means there is a dearth of performance investigations in low- and middle-income countries with different socio-economic settings. This study evaluated the applicability of SARS-CoV-2 RNA monitoring in wastewater (n = 132) to inform COVID-19 infection in the city of Bangkok, Thailand using CDC N1 and N2 RT-qPCR assays. Wastewater influents (n = 112) and effluents (n = 20) were collected from 19 centralized wastewater treatment plants (WWTPs) comprising four large, four medium, and 11 small WWTPs during seven sampling events from January to April 2021 prior to the third COVID-19 resurgence that was officially declared in April 2021. The CDC N1 assay showed higher detection rates and mostly lower Ct values than the CDC N2. SARS-CoV-2 RNA was first detected at the first event when new reported cases were low. Increased positive detection rates preceded an increase in the number of newly reported cases and increased over time with the reported infection incidence. Wastewater surveillance (both positive rates and viral loads) showed strongest correlation with daily new COVID-19 cases at 22-24 days lag (Spearman's Rho = 0.85-1.00). Large WWTPs (serving 432,000-580,000 of the population) exhibited similar trends of viral loads and new cases to those from all 19 WWTPs, emphasizing that routine monitoring of the four large WWTPs could provide sufficient information for the city-scale dynamics. Higher sampling frequency at fewer sites, i.e., at the four representative WWTPs, is therefore suggested especially during the subsiding period of the outbreak to indicate the prevalence of COVID-19 infection, acting as an early warning of COVID-19 resurgence.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Water Purification / COVID-19 Type of study: Experimental Studies / Observational study / Prognostic study Limits: Humans Country/Region as subject: Asia Language: English Journal: Sci Total Environ Year: 2022 Document Type: Article Affiliation country: J.scitotenv.2021.151169

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Water Purification / COVID-19 Type of study: Experimental Studies / Observational study / Prognostic study Limits: Humans Country/Region as subject: Asia Language: English Journal: Sci Total Environ Year: 2022 Document Type: Article Affiliation country: J.scitotenv.2021.151169