The results of the laboratory tests of the National Network of Sewage Epidemiology for the epidemiological surveillance of the SARS-CoV-2 virus in urban wastewater, which operates under the coordination of EODY, are announced.
The samples come from the Attica Region and the cities of Thessaloniki, Larissa, Volos, Heraklion, 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 13 to 19 December 2021, there were declining trends, compared to the week 6 to 12 December 2021, in the average weekly viral load of SARS-CoV-2 in the urban wastewater of seven of the thirteen (7/13) areas tested from the National Network of Sewage Epidemiology (EDEL) of EODY, increasing trends in four of the thirteen (4/13) areas of EDEL and stabilizing trends in two of the thirteen (2/13) areas of EDEL.
Net reduction of viral load in urban wastewater was observed in Xanthi (-30%), Rethymno (-37%), Ioannina (-39%), Larissa (-40%), Alexandroupolis (-42%) and Volos (-47%), while the reduction observed in Thessaloniki was marginal (-22%).
Clearly increasing trends were observed in the viral load of urban wastewater in Agios Nikolaos (+ 54%), Patras (+ 57%), Chania (+ 103%) and Corfu (+ 241%). The viral load of urban wastewater in the Attica Region (+ 9%) and Heraklion (+ 12%) remained virtually stable.
Region of Attica: In the last week, 13-19 / 12/21, the average weekly viral load in the urban wastewater of the Attica Region showed a stabilizing trend, with a statistically insignificant change (+ 9%) of the weekly average compared to the previous week, 06- 12/12/21. The upward trend in the viral load of wastewater in the Attica Region started in mid-September 2021 and since then the viral load has gradually increased. The largest increase was observed in the last two weeks of October and the first week of November, while in the remaining weeks of November and the third of December the viral load of urban wastewater in the Attica Region shows stabilizing trends with insignificant fluctuations.
Thessaloniki: In the last week, 13-19 / 12/21, in Thessaloniki, the weekly average value of the viral load of urban wastewater showed a marginal decrease (-22%) compared to the previous week, 06-12-12. The average weekly value of viral load has decreased overall (-51%) over the last three weeks. Nevertheless, the viral load of urban wastewater in the city of Thessaloniki is still at high levels.
Larissa: In the last week, 13-19 / 12/21, the average weekly viral load of urban wastewater in Larissa showed a decrease (-40%) compared to the week 06-12 / 12/21.
Marble: In the last week, 13-19 / 12/21, the average weekly viral load of urban wastewater in Volos decreased (-47%) compared to the week 06-12 / 12/21.
Heraklion: In the last week, 13-19 / 12/21, in the city of Heraklion, the weekly average value of the viral load of urban wastewater showed a marginal and insignificant increase (+ 12%) compared to the previous week, 06-12 / 12 / 21. Viral load levels remain particularly high.
Chania: In the last week, 13-19 / 12/21, in the city of Chania, the weekly average value of the viral load of urban wastewater continued to show an increase (+ 103%) compared to the previous week, 06-12-12 . Viral load levels remain particularly high.
Rethimno: In the last week, 13-19 / 12/21, in the city of Rethymno, the average viral load of urban wastewater showed a decrease (-37%) compared to the week 06-12 / 12/21. Viral load levels remain high.
Saint Nicholas: In the last week, 13-19 / 12/21, in the city of Agios Nikolaos, the weekly average value of the viral load of urban wastewater continued to show an increase (+ 54%) compared to the last week, 06-12 / 12 / 21. Viral load levels remain high.
Patras: In the last week, 13-19 / 12/21, in Patras, the average weekly viral load of urban wastewater showed an increase (+ 57%) compared to the previous week, 06-12 / 12/21. The weekly average of the viral load is high.
Blonde: In the last week, 13-19 / 12/21, in Xanthi, the average weekly viral load of urban wastewater showed a decrease (-30%) compared to the week 06-12 / 12/21.
Alexandroupolis: In the last week, 13-19 / 12/21, in Alexandroupolis, the average weekly viral load of urban wastewater showed a decrease (-42%) compared to the week 06-12 / 12/21.
Janina: In the last week, 13-19 / 12/21, in Ioannina, the average weekly viral load of urban wastewater showed a decrease (-39%) compared to the previous week, 06-12 / 12/21.
Corfu: In the last week, 13-19 / 12/21, in the city of Corfu, the average weekly viral load of urban wastewater showed a significant increase (+ 241%) compared to the previous week, 06-12 / 12/21.
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