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 22 to 28 November 2021, there were increasing trends, compared to the week 15 to 21 November 2021, in the average weekly viral load of SARS-CoV-2 in the urban wastewater of four of the thirteen areas (04/13) tested from the National Network of Sewage Epidemiology (EDEL) of EODY, stabilizing trends were observed in three of the thirteen (03/13) areas of EDEL and a decrease in viral load was observed in six (06/13) areas of EDEL. A net increase in the average weekly viral load of urban wastewater was observed in Ioannina (+ 40%), Agios Nikolaos (+ 65%) and Patras (+ 80%), while a marginal increase was observed in Thessaloniki (+ 19%). The viral load of urban wastewater remained virtually stable in Larissa (-7%), in the Attica Region (+ 4%) and in Alexandroupolis (+ 10%). A decrease in the average weekly viral load of urban wastewater was observed in Volos (-31%), Chania (-38%), Rethymno (-35%) and Corfu (-59%), while the decrease was observed in Xanthi (-11%) and in Heraklion (-20%).
Region of Attica: In the last week, 22-28 / 11/21, the average weekly viral load in the urban wastewater of the Attica Region showed a stabilizing trend, with a statistically insignificant change (+ 4%) of the weekly average compared to the previous week, 15- 21/11/21. 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 then and until today the viral load of urban wastewater shows a stabilizing trend. The viral load remains high.
Thessaloniki: In the last week, 22-28 / 11/21, in Thessaloniki, the weekly average value of the viral load of urban wastewater showed a marginal increase (+ 19%) compared to the previous week, 15-21 / 11/21. The weekly average value of the viral load, from mid-September until today, has increased by 830%, with the result that the viral load of urban wastewater in the city of Thessaloniki is at very high levels.
Larissa: In the last week, 22-28 / 11/21, the average weekly viral load of urban wastewater in Larissa remained stable (-7%) compared to the week 15-21 / 11/21. Viral load levels remain particularly high.
Marble: In the last week, 22-28 / 11/21, the average weekly viral load of urban wastewater in Volos decreased (-31%) compared to the week 15-21 / 11/21. Viral load levels remain high.
Heraklion: In the last week, 22-28 / 11/21, in the city of Heraklion, the weekly average value of the viral load of urban wastewater showed a marginal decrease (-20%) compared to the previous week, 15-21 / 11/21. Viral load levels remain high.
Chania: In the last week, 22-28 / 11/21, in the city of Chania, the weekly average value of the viral load of urban wastewater showed a decrease (-38%) compared to the previous week, 15-21 / 11/21. Viral load levels remain high.
Rethimno: In the last week, 22-28 / 11/21, in the city of Rethymno, the average viral load of sewage showed a decrease (-35%) compared to the week 15-21 / 11/21. Viral load levels remain high.
Saint Nicholas: In the last week, 22-28 / 11/21, in the city of Agios Nikolaos, the weekly average value of the viral load of urban wastewater showed an increase (+ 65%) compared to the last week, 15-21 / 11/21. Viral load levels are characterized by high.
Patras: In the last week, 22-28 / 11/21, in Patras, the average weekly viral load of urban wastewater showed an increase (+ 80%) compared to the previous week, 15-21 / 11/21. The viral load of urban wastewater is at a high level.
Blonde: In the last week, 22-28 / 11/21, in Xanthi, the average weekly viral load of urban wastewater showed a marginal decrease (-11%) compared to the week 15-21 / 11/21. Viral load levels remain high.
Alexandroupolis: In the last week, 22-28 / 11/21, in Alexandroupolis, the average weekly viral load of urban wastewater remained virtually stable (+ 10%) compared to the week 15-21 / 11/21. Viral load levels remain particularly high.
Janina: In the last week, 22-28 / 11/21, in Ioannina, the average weekly viral load of urban wastewater showed an increase (+ 40%) compared to the previous week, 15-21 / 11/21.
Corfu: In the last week, 22-28 / 11/21, in the city of Corfu, the average weekly viral load of urban wastewater showed a decrease (-59%) compared to the previous week, 15-21 / 11/21.
Note: The laboratories participating in the network are: Laboratory of Analytical Chemistry of the National and Kapodistrian University of Athens, Interdisciplinary Laboratory Group of Sewage Epidemiology of the Aristotle University of Thessaloniki, Regional Laboratory of Public Health of Thessaly, Laboratory Of Hygiene and Epidemiology of the Department of Medicine of the University of Ioannina.
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