The samples come from the Region of Attica and the cities of Thessaloniki, Larissa, Volos, Heraklion, Chania, Agios Nikolaos Lasithi, Patras, Xanthi, Alexandroupoli, Ioannina and Corfu.
The results of the laboratory tests of the National Wastewater Epidemiology Network for the epidemiological surveillance of the SARS-CoV-2 virus in municipal wastewater, which operates under the coordination of the EODY, were issued by the organization for the week of July 18, 2022 – July 24, 2022.
The samples come from the Region of Attica and the cities of Thessaloniki, Larissa, Volos, Heraklion, Chania, Agios Nikolaos Lasithi, Patras, Xanthi, Alexandroupoli, Ioannina and Corfu. The samples are taken from the inlets of the local Sewage Treatment Units (STUs) and correspond to the population served by them.
Conclusions: In the week of July 18 to 24, 2022, increasing trends were observed, compared to the week of July 11 to 17, 2022, in the average weekly viral load of SARS-CoV-2 in municipal wastewater in four of the twelve (4/12) areas tested from the National Wastewater Epidemiology Network (EDEL) of EODY, downward trends in six of the twelve (6/12) EDEL areas and stabilization in two of the twelve (2/12) EDEL areas. The trend in the average weekly viral load of municipal wastewater in Ioannina (+32%) was clearly upward, while the increase was marginal in Xanthi (+28%), the Attica Region (+20%) and Thessaloniki (+12%) . Net downward trends were observed in Patras (-52%), Larissa (-43%), Chania (-40%) and Agios Nikolaos (-37%), while the reduction of the viral load in municipal wastewater in Corfu was marginal (-18%) and in Alexandroupoli (-11%). The viral load of municipal sewage remained stable in Heraklion (+10%) and Volos (-6%).
Region of Attica: In the last week, 18-24/07/2022, the average weekly viral load in the urban wastewater of the Attica Region showed a stabilizing trend, with a statistically insignificant change (marginal increase) (+20%) of the weekly average compared to the previous one week, 11-17/07/2022.
Thessaloniki: In the last week, 18-24/07/2022, the weekly average value of the viral load of municipal wastewater in Thessaloniki showed a marginal increase (+12%) compared to the previous week, 11-17/07/2022.
Larisa: In the last week, 18-24/07/2022, a decrease (-43%) was observed in the weekly average value of the viral load of urban sewage in Larissa compared to the week 11-17/07/2022.
Marble: In the last week, 18-24/07/2022, no notable change (-6%) was observed in the weekly average value of the viral load of the urban sewage in Volos, which remained essentially stable, compared to the week 11-17/07/ 2022.
Blonde: In the last week 18-24/07/2022, a marginal increase (+28%) was observed in the weekly average value of the viral load of municipal sewage in Xanthi compared to the week 11-17/07/2022.
Alexandroupoli: In the last week, 18-24/07/2022, a marginal decline (-11%) was observed in the weekly average value of the viral load of the urban sewage in Alexandroupoli, compared to the week 11-17/07/2022.
Patras: In the last week, 18-24/07/2022, in Patras, the weekly average value of the viral load of urban wastewater showed a decrease (-52%) compared to the previous week 11-17/07/2022. The weekly average viral load is moving at high levels.
Heraklion: In the last week, 18-24/07/2022, in the city of Heraklion, the weekly average value of the viral load of urban sewage did not show a significant change (+10%), i.e. it remained essentially stable compared to the previous week, 11- 17/07/2022.
Chania: In the last week, 18-24/07/2022, in the city of Chania, the weekly average value of the viral load of urban sewage showed a decrease (-40%) compared to the previous week, 11-17/07/2022.
Saint Nicholas: In the last week, 18-24/07/2022, in the city of Agios Nikolaos, the weekly average value of the viral load of municipal wastewater showed a decrease (-37%) compared to the previous week, 11-17/07/2022.
Janina: In the last week, 18-24/07/2022, in Ioannina, the weekly average value of the viral load of urban sewage showed an increase (+32%) compared to the previous week, 11-17/07/2022.
Corfu: In the last week, 18-24/07/2022, in Corfu, the weekly average value of the viral load of municipal sewage showed a marginal decrease (-18%) compared to the last week, 11-17/07/2022.
Note: The laboratories participating in the network are: Laboratory of Analytical Chemistry of the National and Kapodistrian University of Athens, Interdisciplinary Laboratory Group of Wastewater Epidemiology of the Aristotle University of Thessaloniki, Regional Laboratory of Public Health of Thessaly, Regional Laboratory of Public Health of Crete, Laboratory of Hygiene of the School of Medicine of the University of Patras, Laboratory of Hygiene and Epidemiology of the Department of Medicine of the University of Ioannina.
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