The results of the laboratory tests of the National Wastewater Epidemiology Network 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 and Ioannina. 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 SARS-CoV-2 viral load concentration in urban wastewater per 100,000 inhabitants per week 10-16 / 01/22 compared to the week 03–09 / 01/22.
Conclusions: During the week 10 to 16 January 2022, there were increasing trends, compared to the week 3 to 9 January 2022, in the average weekly viral load of SARS-CoV-2 in the urban wastewater of seven of the twelve (7/12) areas tested from the National Network of Sewage Epidemiology (EDEL) of EODY, downward trends were observed in one area (1/12) of EDEL and stabilizing trends were observed in the other four (4/12) areas that
were audited by EDEL. The purely upward trends ranged from + 32% in Volos to + 281% in Patras.
The viral load of urban wastewater remained stable in Larissa (+ 8%), Xanthi (-10%), Ioannina (-6%) and the Attica Region (-6%). Reduction in the viral load of urban wastewater was observed in Thessaloniki (-31%).
Region of Attica: In the last week, 10-16 / 01/22, the average weekly viral load in the urban wastewater of the Attica Region showed a stabilizing trend, with a statistically insignificant decrease (-6%) of the weekly average compared to the previous week, 03- 09/01/22. The upward trend in the viral load of wastewater of 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 2021 and the first week of November 2021, while the rest weeks of November 2021 showed stabilizing trends at high levels. The viral load in the wastewater of the Attica Region continued to show stabilizing trends with insignificant fluctuations in the first three weeks of December 2021, while in the fourth week of December 2021 the viral load showed a large increase, recording the highest value ever observed, a trend which continued until the first week of January 2022. Its second week
January showed a stabilizing trend.
Thessaloniki: In the last week, 10-16 / 01/22, the weekly average value of the viral load of urban wastewater in Thessaloniki decreased (-31%) compared to the previous week, 03-09 / 01/22, for the first time since from three weeks of continuous growth. However, the viral load of the city remains high. Based on daily specific analyzes in the wastewater, the weekly average value of the frequency of the Omicron strain in the wastewater of 8 Thessaloniki, in the last week, 10-16 / 01/22, ranged at 87%, at the same levels (-2%) as the last week.
Larissa: In the last week, 10-16 / 01/22, the average weekly viral load of urban wastewater in Larissa remained stable (+ 8%) compared to the week 03-09 / 01/22.
Marble: In the last week, 10-16 / 01/22, the average weekly viral load of urban wastewater in Volos increased (+ 32%) compared to the week 03-09 / 01/22.
Heraklion: In the last week, 10-16 / 01/22, in the city of Heraklion, the weekly average value of the viral load of urban wastewater showed an increase (+ 118%) compared to the previous week, 03-09 / 01/22.
Chania: In the last week, 10-16 / 01/22, in the city of Chania, the weekly average value of the viral load of urban wastewater showed an increase (+ 50%) compared to the previous week, 03-09 / 01/22.
Rethimno: In the last week, 10-16 / 01/22, in the city of Rethymno, a significant increase (+ 239%) was recorded in the average value of the viral load of urban wastewater, compared to the week 03-09 / 01/22.
Saint Nicholas: In the last week, 10-16 / 01/22, in the city of Agios Nikolaos, the weekly average value of the viral load in the urban wastewater showed an increase (+ 113%) compared to the previous week, 03-09 / 01/22.
Patras: In the last week, 10-16 / 01/22, in Patras, the average weekly viral load of urban wastewater showed a large increase (+ 281%) compared to the previous week, 03-09 / 01/22. The weekly average value of the viral load of urban wastewater is high.
Blonde: In the last week, 10-16 / 01/22, in Xanthi, the average weekly viral load of urban wastewater remained stable (-10%) compared to the week 03-09 / 01/22.
Alexandroupolis:In the last week, 10-16 / 01/22, in Alexandroupolis, the average weekly viral load of urban wastewater showed an increase (+ 35%) compared to the week 03-09 / 01/22.
Janina: In the last week, 10-16 / 01/22, in Ioannina, the average weekly viral load of urban wastewater remained stable (-6%) compared to the previous week, 03-09 / 01/22.
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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