Koronovios-Sewage: The viral load was “launched” in Ioannina, Corfu, Attica – Reduction in Alexandroupolis

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, were 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.

Table 1: Percentage change in the mean concentration of the SARS-CoV-2 viral load in urban wastewater per 100,000 inhabitants per week 20–26 / 12/2021 compared to the week 13–19 / 12/2021.

Conclusions: During the week 20 to 26 December 2021, there were increasing trends, compared to the week 13 to 19 December, in the average weekly viral load of SARS-CoV-2 in the urban wastewater of six of the twelve (6/12) areas controlled by the National Network of Sewage Epidemiology (EDEL) of EODY, downward trends in five of the twelve (5/12) areas of EDEL and stabilizing trends in one of the twelve (1/12) areas of EDEL. Net increase of viral load in urban wastewater was observed in Heraklion (+ 35%), Attica Region (+ 100%), Corfu (+ 191%) and Ioannina (+ 233%), while a marginal increase was observed in Thessaloniki (+ 14%) and in Chania (+ 26%). A net reduction of the viral load in urban wastewater was observed in Alexandroupolis (-34%), while the reductions were marginal in Volos (-14%), Xanthi (-18%), Larissa (-21%) and Rethymno ( -26%). The viral load of urban wastewater in Patras remained stable (+ 1%).

Region of Attica: In the last week, 20-26 / 12/21, the average weekly viral load in the urban wastewater of the Attica Region showed a significant increase (+ 100%) of the weekly average compared to the previous week, 13-19 / 12/21. The upward trend in the viral load of sewage in the Attica region started in mid-September 2021. Since then the viral load has gradually increased, with the first large increase being recorded in the last two weeks of October and the first week of November. In the remaining weeks of November as well as in the first three weeks of December the viral load in the wastewater of the Attica Region showed stabilizing trends with insignificant fluctuations, while in the fourth week of December (20-26 / 12/21) the viral load showed a large increase , recording the highest value observed to date.

Thessaloniki: In the last week, 20-26 / 12/21, in Thessaloniki, the weekly average value of the viral load of urban wastewater showed a marginal increase (+ 14%) compared to the previous week, 13-19 / 12/21. It is noted, however, that the downward trend of the viral load, recorded in the previous two weeks in the city of 8 Thessaloniki, was reversed with the daily average values ​​from December 18 to December 26 showing an overall increase of 57%. The viral load of sewage in Thessaloniki remains at high levels.

Larissa: In the last week, 20-26 / 12/21, the average weekly viral load of urban wastewater in Larissa showed a marginal decrease (-21%) compared to the week 13-19 / 12/21. Volos: In the last week, 20-26 / 12/21, the average weekly viral load of urban wastewater in Volos showed a marginal decline (-14%) compared to the week 13-19 / 12/21.

Heraklion: In the last week, 20-26 / 12/21, and more specifically the period 20-24 / 12/21, in the city of Heraklion, the weekly average value of the viral load of urban wastewater showed a small increase (+ 35%) in compared to the previous week, 13-19 / 12/21. Viral load levels remain high.

Chania: In the last week, 20-26 / 12/21, and more specifically the period 20-24 / 12/21, in the city of Chania, the weekly average value of the viral load of urban wastewater showed a marginal increase (+ 26%) compared to the previous week, 12-19 / 12/21. Viral load levels remain high.

Rethimno: In the last week, 20-26 / 12/21, and more specifically in the period 20-24 / 12/21, in the city of Rethymno, the average viral load of wastewater showed a marginal decrease (-26%) compared to the week 13-19 / 12/21. Viral load levels remain high.

Patras: In the last week, 20-26 / 12/21, in Patras, the average weekly viral load of urban wastewater remained stable (+ 1%) compared to the previous week, 13-19 / 12/21. The weekly average value of the viral load of urban wastewater is high.

Blonde: In the last week, 20-26 / 12/21, in Xanthi, the average weekly viral load of urban wastewater showed a marginal decrease (-18%) compared to the week 13-19 / 12/21.

Alexandroupolis: In the last week, 20-26 / 12/21, in Alexandroupolis, the average weekly viral load of urban wastewater showed a decrease (-34%) compared to the week 13-19 / 12/21.

Janina: In the last week, 20-26 / 12/21, in Ioannina, the average weekly viral load of urban wastewater showed a significant increase (+ 233%) compared to the previous week, 13-19 / 12/21.

Corfu: In the last week, 20-26 / 12/21, in the city of Corfu, the average weekly viral load of urban wastewater showed a significant increase (+ 191%) compared to the previous week, 13-19 / 12/21.

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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