The samples come from Region of Attica and its cities Thessalonikiτης Of Larissaτου Volosτου Heraklionτων Chania, Rethymnon, Agios Nikolaos Lassithi, Patras, Xanthi, Alexandroupolis, Ioannina and Corfu. The samples are taken from the entrances of the local Wastewater Treatment Plants (WWUs) and correspond to the population served by them.
Conclusions: During the week 14 to 20 March 2022, there were increasing trends, compared to the week 7 to 13 March 2022, in the average weekly viral load of SARS-CoV-2 in urban wastewater in six of the thirteen (6/13) areas controlled by the National Network of Sewage Epidemiology (EDEL) of EODY, downward trends in five of the thirteen (5/13) areas of EDEL and stabilizing trends in two of the thirteen (2/13) areas controlled by EDEL. Clearly increasing trends were observed in Ioannina (+ 51%), Thessaloniki (+ 74%), Chania (+ 81%) and Corfu (+ 105%), while the increase was marginal in the Attica Region (+ 18%) and in Patras (+ 26%). Clearly declining trends were observed in Agios Nikolaos (-77%) and Rethymno (-33%), while the decline was marginal in Heraklion (-25%), Alexandroupoli (-23%) and Xanthi (-17%). The viral load of urban wastewater remained virtually constant at
Larissa (+ 1%) and in Volos (-1%).
Region of Attica: In the last week, 14-20 / 03/22, the average weekly viral load in the urban wastewater of the Attica Region showed an increasing trend, with a marginal increase (+ 18%) of the weekly average compared to the previous week, 07-13 / 03/22. The upward trend started on Sunday 06/03/22.
Thessaloniki: In the last week, 14-20 / 03/22, the weekly average value of the viral load of urban wastewater in Thessaloniki showed a significant increase (+ 74%) compared to the previous week, 07-13 / 03/22. The viral load of the city is at high levels. Based on specific PCRs that selectively multiply genomic sections of Omicron BA.1 and Delta strains, in the last week, the frequency of BA.1 variant in city wastewater
estimated at 25%, while Delta was not detected. As only the two variants of the Omicron strain are now found in Thessaloniki, the frequency of BA.2 is estimated at 75%.
Larissa: In the last week, 14-20 / 03/22, there was no change (+ 1%) in the weekly average value of the viral load of urban wastewater in Larissa compared to the week 07-13 / 03/22.
Marble: In the last week, 14-20 / 03/22, there was no change (-1%) in the weekly average value of the virus
of urban wastewater in Volos, in relation to the week 07-13 / 03/22.
Blonde: In the last week, 14-20 / 03/22, there was a marginal decline (-17%) in the weekly average value of the viral load of urban wastewater in Xanthi in relation to the week 07-13 / 03/22.
Alexandroupolis: In the last week, 14-20 / 03/22, there was a marginal decline (-23%) in the weekly average value of the viral load of urban wastewater in Alexandroupolis, compared to the week 07-13 / 03/22.
Patras: In the last week, 14-20 / 03/22, in Patras, the weekly average value of the viral load of urban wastewater showed a marginal increase (+ 26%) compared to the previous week, 07-13 / 03/22. The weekly mean value of the viral load shows stability.
Heraklion: In the last week, 14-20 / 03/22, in the city of Heraklion, the weekly average value of the viral load of urban wastewater showed a marginal decrease (-25%) compared to the previous week, 07-13 / 03/22. Viral load levels remain high.
Chania: Last week, 14-20 / 03/22, in the city of Chania, the weekly average value of the viral load of urban wastewater continued to increase (+ 81%) compared to the previous week, 07-13 / 03/22. Viral load levels remain high.
Rethimno: In the last week, 14-20 / 03/22, in the city of Rethymno, the weekly average value of the viral load of urban wastewater showed a slight decrease (-33%) compared to the previous week, 07-13 / 03/22. The viral load is at high levels.
Saint Nicholas: In the last week, 14-20 / 03/22, in the city of Agios Nikolaos, the weekly average value of the viral load of urban wastewater showed a decrease (-77%) compared to the last week, 07-13 / 03/22. The viral load is still high.
Janina: In the last week, 14-20 / 03/22, in Ioannina, the weekly average value of the viral load of urban wastewater showed an increase (+ 51%) compared to the previous week, 07-13 / 03/22.
Corfu: In the city of Corfu in the last week, 14-20 / 03/22, the average weekly viral load in the wastewater showed an increase (+ 105%) compared to the previous week, 07-13 / 03/22.
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