The results of the laboratory tests of the National Wastewater Epidemiology Network for the epidemiological surveillance of SARS-CoV-2 virus in urban waste water, which operates under the coordination of EODY. 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 of March 28 to April 3, 2022, there were increasing trends, compared to the week of March 21 to 27, 2022, in the average weekly viral load of SARS-CoV-2 in urban wastewater in four of the thirteen (4/13) areas tested from the National Network of Sewage Epidemiology (EDEL) of EODY, downward trends in seven of the thirteen (7/13) areas of EDEL and stabilizing trends in two of the thirteen (2/13) areas controlled by EDEL.
Clearly increasing trends were observed in Xanthi (+ 32%), Patras (+ 33%) and Alexandroupolis (+ 41%), while the increase was marginal in Volos (+ 25%).
Net declining trends were observed in Agios Nikolaos (-31%), Chania (-36%), Ioannina (-54%), Corfu (-57%) and Rethymno (-58%), while the decrease was marginal in Attica Region (-16%) and Heraklion (-28%).
The viral load of urban wastewater remained substantial stable in Thessaloniki (+ 5%) and Larissa (+ 5%).
Region of Attica: In the last week, 28 / 03-03 / 04/22, the average weekly viral load in the urban wastewater of the Attica Region showed a marginally downward trend, with a statistically insignificant decrease (-16%) of the weekly average compared to the previous week , 21-27 / 03/22. The upward trend started on Sunday 06/03/22, with the largest increase being recorded in the fourth week of March. This increase is largely due to the spread of Omicron BA.2. The last week has seen relative stabilization.
Thessaloniki: In the last week, 28 / 03-03 / 04/22, the weekly average value of the viral load of urban wastewater in Thessaloniki remained stable (+ 5%) compared to the previous week, 21-27 / 03/2022, for the first time once a month of continuous increase. The viral load in the city of Thessaloniki is still at very high levels.
Larissa: In the last week, 28 / 03-03 / 04/22, no significant change (+ 5%) was observed in the weekly average value of the viral load of urban wastewater in Larissa in relation to the week 21-27 / 03/2022.
Marble: In the last week, 28 / 03-03 / 04/22, there was a marginal increase (+ 25%) in the weekly average value of the viral load of urban wastewater in Volos, compared to the week 21-27 / 03/2022.
Blonde: In the last week, 28 / 03-03 / 04/22, there was an increase (+ 32%) in the weekly average value of the viral load of urban wastewater in Xanthi compared to the week 21-27 / 03/2022.
Alexandroupolis: In the last week, 28 / 03-03 / 04/22, there was an increase (+ 41%) in the weekly average value of the viral load of urban wastewater in Alexandroupolis, compared to the week 21-27 / 03/2022.
Patras: In the last week, 28 / 03-03 / 04/22, in Patras, the weekly average value of the viral load of urban wastewater showed an increase (+ 33%) compared to the previous week, 21-27 / 03/22. The weekly mean value of the viral load shows a steadily increasing course with high concentrations.
Heraklion: In the last week, 28 / 03-03 / 04/22, in the city of Heraklion, the weekly average value of the viral load of urban wastewater showed a marginal decrease (-28%) compared to the previous week, 21-27 / 03 / 22.
Chania: In the last week, 28 / 03-03 / 04/22, in the city of Chania, the weekly average value of the viral load of urban wastewater showed a decrease (-36%) compared to the previous week, 21-27 / 03/22 .
Rethimno: In the last week, 28 / 03-03 / 04/22, in the city of Rethymno, there was a decrease (-58%) in the average weekly viral load of SARS-CoV-2 in urban wastewater, compared to the previous week, 21- 27/03/22.
Saint Nicholas: Last week, 28 / 03-03 / 04/22, in the city of Agios Nikolaos, the weekly average value of the viral load of urban wastewater showed a decrease (-31%) compared to the last week, 21-27 / 03 / 22.
Ioannina: In the last week, 28 / 03-03 / 04/22, in Ioannina, the weekly average value of the viral load of urban wastewater showed a decrease (-54%) compared to the previous week, 21-27 / 03/22.
Corfu: In the last week, 28 / 03-03 / 04/22, in the city of Corfu, the average weekly viral load in the wastewater showed a decrease (-57%) compared to the previous week, 21-27 / 03/22.
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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