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La Rosa, Giuseppina; Mancini, P.; Iaconelli, M.; Veneri, C.; Bonanno Ferraro, G.; Del Giudice, C.; Suffredini, E.; Muratore, A.; Ferrara, F.; Lucentini, L.; Martuzzi, M.; Piccioli, A.
Science of the total environment, 01/2024, Volume: 906Journal Article
The detection of SARS-CoV-2 in water environments has predominantly focused on wastewater, neglecting its presence in oceanic waters. This study aimed to fill this knowledge gap by investigating the occurrence of SARS-CoV-2 in remote sea and oceanic waters, at large distances from the coastline. Forty-three 500-liter samples were collected between May 2022 and January 2023 from the Atlantic Ocean, the Mediterranean Sea, the Arctic region, the Persian Gulf and the Red Sea. Using molecular detection methods including real-time RT-qPCR and nested PCR followed by sequencing, we successfully detected SARS-CoV-2 RNA in 7 of the 43 marine water samples (16.3 %), and specifically in samples taken from the Atlantic Ocean and the Mediterranean Sea. The estimated concentrations of SARS-CoV-2 genome copies in the positive samples ranged from 6 to 470 per 100 l. The presence of mutations characteristic of the Omicron variant was identified in these samples by amplicon sequencing. These findings provide evidence of the unforeseen presence of SARS-CoV-2 in marine waters even at distances of miles from the coastline and in open ocean waters. It is important to consider that these findings only display the occurrence of SARS-CoV-2 RNA, and further investigations are required to assess if infectious virus can be present in the marine environment. Display omitted •An investigation into the presence of SARS-CoV-2 RNA in distant sea and oceanic waters is presented.•The study reveals the existence of SARS-CoV-2 RNA in 16.3 % of samples, including remote oceanic waters.•The Omicron variant was detected in samples from the Atlantic Ocean and the Mediterranean Sea.•The findings emphasize the need for studies on virus circulation dynamics in marine environments.
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