Seroprevalences (detection of specific antibodies) provide information on how many people have become infected with the novel coronavirus SARS-CoV-2 or have developed antibodies due to vaccination.
Seroprevalence by region over time
The 5th test phase took place in the cantons of Ticino and Zurich in March 2022. In Valais and Vaud, the blood samples were taken in November/December 2021 – i.e. before the Omikron wave.
The 6th test phase took place in the cantons of Ticino, Vaud, Valais and Zurich in June 2022. Seroprevalence was again very high, as was the proportion of neutralization. This indicates that a large proportion of the participants have both experienced (at least) one infection and have been vaccinated.
Seroprevalence by region in the 20-64 year olds
