COVID-⁠19 Switzerland

Information on the current situation, as of 29 November 2022

The key figures will be published each Tuesday at 15:30.

Epidemiological course,Switzerland and Liechtenstein

Viral load in wastewater

The data published here are based on information obtained from the federal government's national wastewater monitoring system. Since January 2022, the national wastewater monitoring system of Switzerland and the Principality of Liechtenstein has determined the SARS-⁠CoV-⁠2 viral load in the wastewater of 103 wastewater treatment plants (WWTP) at regular intervals.

Wastewater samples are collected from wastewater treatment plants three to six times per week. The absolute viral load (gene copies/day) is specified per 100,000 inhabitants. A dilution factor based on the wastewater treatment plant's flow volume is taken into account, for instance during dry periods. The relative viral load is the measured viral load (gene copies/litre) as a proportion of the historically measured maximum value. The proportion of relative viral load is calculated by dividing the proportion of absolute viral load by the proportion of the historic maximum viral load value. The residential population comprises the catchment area of each wastewater treatment plant (WWTP). Seasonal fluctuations in the non-⁠permanent population, which influence the viral load particularly in busy tourist areas, are not included. Wastewater treatment plants (WWTP) no longer participating in the project will not be included when calculating the proportion of viral load per category. However, historical measurements will still be available when viewing the development over time.

Detailed information on the measuring methods and terminology can be found on the Eawag website. New findings may lead to changes in the calculation of the data. Recently, the time frame desired can be selected with the slider below the graph.

Geographical distribution

Viral load in wastewater, Switzerland and Liechtenstein, 07.02.2022 to 28.11.2022

The graph shows the relative viral load in per cent as a 7-⁠day average in the wastewater treatment plants (WWTPs) and the difference in viral load compared with the previous week in percentage points (pp) in Switzerland and Liechtenstein. The percentage point figure is used to compare percentages. The 7-⁠day relative share refers to the historical maximum values for each wastewater treatment plant.
Cant. Name Population coverage Relative viral load Difference to previous week
AG Aarau AG Aarau 78 255 49,5% 38,3
AG Aarburg AG Aarburg 30 884 63,3% 58,3
AG Baden AG Baden 59 560 25,4% 20,7
AG Bremgarten AG Bremgarten 22 613 19,1% 15,4
AG Brugg AG Brugg 46 250 49,6% 47,4
AG Kaisten AG Kaisten 25 354 0,9% -
AG Lenzburg AG Lenzburg 54 568 53,2% -
AG Reinach AG Reinach 23 817 1,0% -
AG Wohlen AG Wohlen 31 992 26,5% 22,9
AG Zofingen AG Zofingen 35 577 3,6% −8,9
AI Appenzell (Boedeli) AI Appenzell (Boedeli) 11 877 8,5% 3,0
AR Herisau (Bachwis) AR Herisau (Bachwis) 16 500 21,7% 1,8
BE Aarwangen (Zala) BE Aarwangen (Zala) 40 845 24,7% −18,1
BE Biel BE Biel 85 389 15,0% −12,1
BE Grindelwald BE Grindelwald 4153 4,6% −8,7
BE Interlaken BE Interlaken 27 945 28,8% −9,6
BE Laupen BE Laupen 62 000 56,4% 25,4
BE Lauterbrunnen BE Lauterbrunnen 2553 5,0% −7,4
BE Lyss BE Lyss 36 358 18,7% −1,3
BE Mittl. Emmental BE Mittl. Emmental 25 733 6,5% −5,1
BE Moossee-Urtenenbach BE Moossee-Urtenenbach 33 844 8,0% −0,7
BE Region Bern BE Region Bern 224 557 23,3% −6,2
BE Saanen BE Saanen 9253 29,5% 7,8
BE Thunersee BE Thunersee 124 550 10,2% −2,5
BE Worblental BE Worblental 71 636 34,4% 4,7
BS Basel BS Basel 273 075 9,0% −13,5
FL Liechtenstein FL Liechtenstein 39 315 7,7% −0,5
FR Fribourg (Aele) FR Fribourg (Aele) 44 211 52,4% 17,7
FR Vuippens (Ais) FR Vuippens (Ais) 34 647 49,1% 17,6
GE Aire GE Aire 451 771 71,5% −9,0
GE Satigny/Bois-de-Bay GE Satigny/Bois-de-Bay 79 577 19,5% 7,6
GE Thonex/Villette GE Thonex/Villette 51 028 9,2% 5,2
GL Glarnerland GL Glarnerland 49 644 17,3% 3,6
GR Arosa GR Arosa 2049 2,3% −11,0
GR Cazis (Waldau) GR Cazis (Waldau) 10 963 20,1% 6,1
GR Chur GR Chur 55 000 25,3% 8,3
GR Davos (Gadenstatt) GR Davos (Gadenstatt) 9706 14,9% 2,4
GR Klosters (Gulfia) GR Klosters (Gulfia) 3155 74,7% 47,9
GR Landquart GR Landquart 17 054 32,7% 9,6
GR Poschiavo (Li Geri) GR Poschiavo (Li Geri) 3358 24,0% 18,5
GR S-chanf (Oberengadin) GR S-chanf (Oberengadin) 15 056 19,0% 4,8
GR Schluein (Gruob) GR Schluein (Gruob) 7823 36,0% −32,0
GR Scuol (Sot Ruinas) GR Scuol (Sot Ruinas) 3473 14,1% 8,2
GR Seewis (Vorderes Prättigau) GR Seewis (Vorderes Prättigau) 8003 19,0% −14,0
JU Delemont (Sede) JU Delemont (Sede) 36 484 13,6% −28,5
JU Porrentruy (Sepe) JU Porrentruy (Sepe) 16 500 55,4% −4,4
LU Buholz (Real) LU Buholz (Real) 183 511 43,5% 7,3
LU Rontal LU Rontal 28 771 44,2% −12,7
NE Colombier (La Saunerie) NE Colombier (La Saunerie) 27 582 33,6% 3,0
NE La-Chaux-de-Fonds NE La-Chaux-de-Fonds 35 360 8,4% −3,4
NE Neuchatel NE Neuchatel 40 697 19,7% −1,0
NW Stans (Rotzwinkel) NW Stans (Rotzwinkel) 21 214 31,9% −7,3
OW Alpnach (Sarneraatal) OW Alpnach (Sarneraatal) 30 657 16,8% −23,8
OW Engelberg OW Engelberg 4053 20,6% 5,6
SG Altenrhein SG Altenrhein 64 000 18,3% 1,7
SG Au (Rosenbergsau) SG Au (Rosenbergsau) 41 281 18,7% 4,3
SG Bad Ragaz SG Bad Ragaz 12 007 11,5% −0,5
SG Buchs SG Buchs 24 844 5,2% −1,5
SG Flawil (Oberglatt) SG Flawil (Oberglatt) 30 378 15,7% 2,6
SG Flums (Seez) SG Flums (Seez) 12 448 4,0% −3,6
SG Rapperswil-Jona SG Rapperswil-Jona 28 168 14,6% 2,9
SG St.Gallen (Au) SG St.Gallen (Au) 37 876 2,2% −5,8
SG St.Gallen (Hofen) SG St.Gallen (Hofen) 57 031 12,4% -
SG Steinach (Morgental) SG Steinach (Morgental) 30 710 12,8% 5,5
SG Wil SG Wil 26 295 12,0% 8,5
SH Hallau (Klettgau) SH Hallau (Klettgau) 14 795 7,6% −2,4
SH Neuhausen A/Rhf. (Roeti) SH Neuhausen A/Rhf. (Roeti) 56 967 19,2% 15,4
SH Ramsen (Bibertal-Hegau) SH Ramsen (Bibertal-Hegau) 100 338 6,5% −4,3
SO Grenchen (Buerenamt) SO Grenchen (Buerenamt) 46 563 38,1% -
SO Winznau (Zv Olten) SO Winznau (Zv Olten) 54 540 12,5% 1,8
SO Zuchwil (Soloth.-Emme) SO Zuchwil (Soloth.-Emme) 95 793 12,2% −5,3
SZ Hoefe SZ Hoefe 29 624 40,7% 13,3
SZ Schwyz SZ Schwyz 31 164 77,2% 49,3
SZ Untermarch SZ Untermarch 29 470 54,5% 13,2
TG Frauenfeld TG Frauenfeld 36 369 38,1% 21,2
TG Hefenhofen (Aachtal, Moos) TG Hefenhofen (Aachtal, Moos) 23 074 11,9% 4,7
TG Weinfelden (Mittelthurgau) TG Weinfelden (Mittelthurgau) 31 342 18,5% −8,5
TI Bellinzona (Giubiasco) TI Bellinzona (Giubiasco) 53 209 42,1% 19,7
TI Chiasso (Vacallo) TI Chiasso (Vacallo) 26 638 25,4% −6,0
TI Locarno (Foce Maggia) TI Locarno (Foce Maggia) 50 781 43,1% 19,8
TI Locarno (Foce Ticino) TI Locarno (Foce Ticino) 24 516 49,1% 12,9
TI Lugano TI Lugano 124 000 40,7% 9,6
TI Mendrisio (Rancate) TI Mendrisio (Rancate) 29 392 63,0% 35,1
UR Altdorf UR Altdorf 33 940 60,4% 6,4
VD Commugny VD Commugny 22 575 38,2% −12,8
VD Gland (Apec) VD Gland (Apec) 36 034 44,7% 3,3
VD Lausanne (Vidy) VD Lausanne (Vidy) 247 824 46,0% −54,0
VD Montreux/Pierrier VD Montreux/Pierrier 41 383 31,8% −13,2
VD Morges VD Morges 39 126 29,7% 11,8
VD Nyon VD Nyon 25 753 17,3% -
VD Vevey (Aviron) VD Vevey (Aviron) 53 864 32,2% −2,2
VD Yverdon VD Yverdon 35 462 43,1% −11,1
VS Bagnes-Le Châble VS Bagnes-Le Châble 7713 12,2% −4,9
VS Brig-Glis (Briglina) VS Brig-Glis (Briglina) 28 678 31,4% −9,6
VS Goms VS Goms 4193 25,7% −14,1
VS Martigny VS Martigny 39 643 12,1% −3,5
VS Sierre/Noes VS Sierre/Noes 32 480 62,0% 13,8
VS Sion/Chateauneuf VS Sion/Chateauneuf 35 632 19,1% 10,1
VS Zermatt VS Zermatt 5507 5,1% −5,9
ZG Cham (Schoenau) ZG Cham (Schoenau) 146 942 69,1% 29,3
ZH Affoltern am Albis ZH Affoltern am Albis 30 226 22,6% −18,3
ZH Andelfingen ZH Andelfingen 7150 19,3% −79,3
ZH Bülach ZH Bülach 35 612 11,4% −15,2
ZH Dietikon (Limeco) ZH Dietikon (Limeco) 83 367 36,1% −4,3
ZH Dübendorf (Ika Neugut) ZH Dübendorf (Ika Neugut) 39 622 17,2% −49,5
ZH Horgen ZH Horgen 26 952 23,7% −29,1
ZH Illnau-Effretikon ZH Illnau-Effretikon 18 921 36,1% 8,4
ZH Meilen (Rorguet) ZH Meilen (Rorguet) 26 447 36,7% −6,5
ZH Niederglatt (Fischb.-Gl.) ZH Niederglatt (Fischb.-Gl.) 43 596 29,2% −13,0
ZH Uster (Jungholz) ZH Uster (Jungholz) 41 303 47,1% −19,8
ZH Werdhölzli ZH Werdhölzli 471 000 23,4% 1,9
ZH Wetzikon (Flos) ZH Wetzikon (Flos) 31 419 34,2% −27,7
ZH Winterthur ZH Winterthur 140 403 43,5% −8,3
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Source: FOPH – Status: 29.11.2022, 08.00h
Geographic distribution over time

View the development of the virus load in wastewater at various WWTPs in Switzerland and Liechtenstein.

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Development over time

Viral load in wastewater, Switzerland and Liechtenstein, 07.02.2022 to 28.11.2022

The figure shows the 7-⁠day average absolute and relative viral load in percent in the wastewater treatment plants (WWTP) and the difference from the previous week's 7-⁠day average in percentage points (pp) in Switzerland and Liechtenstein. The relative proportion per 7-⁠day period refers to the historically measured maximum value per wastewater treatment plant.

Recently, the time frame desired can be selected with the slider below the graph.

Region Bern, BE Population coverage: 224 557
7-⁠⁠day average from 20.11.2022
Relative viral load 23,3%
Absolute viral load 3.3e+12
Difference to previous week −6,2pp
Measured
7-⁠⁠day average

Relative viral load

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Source: FOPH – Status: 29.11.2022, 08.00h