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Back Wastewater monitoring for the presence of SARS-CoV-2 virus in the Slovak Republic – progress on 39th calendar week 2023 - RT-PCR and ddPCR analysis

Monitoring of wastewater in the Slovak Republic for the presence of SARS-CoV-2 virus was launched on 02.05. 2021 (i.e. 18th calendar week) and it is performed regularly on a weekly basis in each region of the Slovak Republic. From January 2022, we gradually started the second phase of the wastewater monitoring project, where monitoring is being expanded in several districts. So far, 62 WWTPs have participated in the Slovak Republic.

Due to the improved epidemiological situation, starting from 19.06.2023, the collection and investigation of waste water samples was reduced.

The presence of virus in wastewater samples is determined by RT-PCR and digital dd-PCR. Samples are taken in cooperation with individual operators of wastewater treatment plants, regional public health authorities and investigated in the NRC at the Public Health Authority of Slovak Republic.

By the 39th calendar week 2023, a total of 4544 samples were examined by a qualitative and quantitative method, of which 4427 (97,43 %) samples were positive or with limit values.

On 39th calendar week 2023, 16 samples were examined. In 9 samples (56,25 %) showed an slight increase in the number of SARS-CoV-2 RNA copies, in the other 7 samples the number of copies remained unchanged or decreased.

Development of WW sample positivity. rate in time

On the 39th calendar week, we noticed a slight increase in quantitative tests, which express the copy number of SARS-CoV-2 RNA.

Average RNA coyp number of SASR-CoV-2 RNA in wastewater samples

Monitoring of the viral load in wastewater in individual regions points to a slight increase in Bratislava, Trnava, Trenčín, Nitra, Žilina, Banská Bystrica and Prešov region.  

On the 39th calendar week, we observed a slight increase in SARS-CoV-2 RNA copy number in wastewater and the slight increase incidence.

Development of the incidence of COVID-19 disease and company number of SARS-CoV-2-RNA in wastewater in the SR 2021, 2023

Number of pamedics visits for patients with COVID and number of SARS-CoV-2 RNA
* Source: Operačné stredisko ZZS, ÚVZ SR

SARS-CoV-2 in wastewater in regions

SARS-CoV-2 in wastewater in district