Volta

SARS-CoV-2 wastewater surveillance at the Arlanda airport and Stockholm city during spring 2023: a comparison of variant distribution at different sectoral levels from aircraft, airport region to city wastewater treatment plants

<title>Abstract</title> Wastewater monitoring, including on aircraft, is a highly efficient method for SARS-CoV-2 surveillance, surpassing traditional passenger testing. Airport wastewater sampling is especially useful for tracking virus spread through travel. This study explored the links between SARS-CoV-2 contents and variants from aircraft to city, assessing the impact of detected variants from international travellers versus the local population. A total of 969 SARS-CoV-2 variants using next-generation sequencing and Freyja software were examined to comprehensively understand the links between the four catchment areas—aircraft, airport, wastewater treatment plants (WWTPs), and the metropolitan area—and compared them to the variants detected in hospitals in Stockholm city. SARS-CoV-2 contents in WWTPs reflected local infection rates, requiring analysis from multiple plants for an accurate city-wide infection assessment. …

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