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: In the week of 21 to 27 February 2022, downward trends were observed, compared to the week of 14 to 20 February 2022, in the average weekly viral load of SARS-CoV-2 in urban wastewater in six of the thirteen (6/13) 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 three of the thirteen (3/13) areas controlled by EDEL.
Clearly declining trends were observed in Chania (-56%), Heraklion (-53%), Patras (-52%) and Ioannina (-36%), while the decline was marginal in Thessaloniki (-22%) and Attica (-16%). Clearly increasing trends were observed in Corfu (+ 36%), Volos (+ 40%), Rethymno (+ 43%) and Agios Nikolaos (+ 63%). The viral load of urban wastewater remained virtually stable in Larissa (-8%), Xanthi (-7%) and Alexandroupolis (+ 7%).
Region of Attica: In the last week, 21-27 / 02/22, the average weekly viral load in the urban wastewater of the Attica Region remained stable, with a statistically insignificant decrease (-16%) of the weekly average, compared to the previous week, 14- 20/02/22. The downward trend observed in the first week of February continues to this day. After the sharp increase observed in the last weeks of December and the stabilizing trend in January, February closes steadily with a downward trend from the first week until today.
Thessaloniki: In the last week, 21-27 / 02/22, the weekly average value of the viral load of urban wastewater in Thessaloniki showed a marginal decrease (-22%) compared to the previous week, 14-20 / 02/22. The viral load of the city is at high levels. Larissa: In the last week, 21-27 / 02/22, the average weekly viral load of urban wastewater in Larissa remained virtually stable (-8%) compared to the week 14-20 / 02/22.
Marble: In the last week, 21-27 / 02/22, the average weekly viral load of urban wastewater in Volos increased (+ 40%) compared to the week 14-20 / 02/22. Xanthi: In the last week, 21-27 / 02/22, in Xanthi, the average weekly viral load of urban wastewater remained stable (-7%) compared to the week 14-20 / 02/22.
Alexandroupolis: In the last week, 21-27 / 02/22, in Alexandroupolis, the average weekly viral load of urban wastewater remained stable (+ 7%) compared to the week 14-20 / 02/22.
Patras: In the last week, 21-27 / 02/22, in Patras, the average weekly viral load of urban wastewater showed a decrease (-52%) compared to the previous week 14-20 / 02/22. The weekly mean value of the viral load shows de-escalation.
Heraklion: In the last week, 21-27 / 02/22, the average weekly viral load in the urban wastewater in the city of Heraklion, showed a decrease (-53%) compared to the previous week, 14-20 / 02/22. The viral load in the urban wastewater of the city remains at high levels.
Chania: In the last week, 21-27 / 02/22, the average weekly viral load in the urban wastewater in the city of Chania, showed a decrease (-56%) compared to the previous week, 14-20 / 02/22.
Rethimno: In the last week, 21-27 / 02/22, the average weekly viral load in the urban wastewater in the city of Rethymnon, showed an increase (+ 43%) compared to the previous week, 14-20 / 02/22.
Saint Nicholas: In the last week, 21-27 / 02/22, the average weekly viral load in the urban wastewater in the city of Agios Nikolaos, showed an increase (+ 63%) compared to the last week, 14-20 / 02/22.
Janina: In the last week, 21-27 / 02/22, in Ioannina, the average weekly viral load of urban wastewater showed a decrease (-36%) compared to the previous week, 14-20 / 02/22.
Corfu: In the last week, 21-27 / 02/22, the viral load in the urban wastewater of the city of Corfu showed an increase (+ 36%) compared to the week 14-20 / 02/22.
Note: The laboratories participating in the network are: Laboratory of Analytical Chemistry of the National and Kapodistrian University of Athens, Interdisciplinary Laboratory Group for Sewage Epidemiology of the Aristotle University of Thessaloniki, Peripheral Laboratory of Public Health of the Republic , Laboratory of Hygiene and Epidemiology of the Department of Medicine of the University of Ioannina.
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