We identify, analyse and advise
The Swiss National COVID-19 Science Task Force advises the public authorities in the current COVID-19 crisis. While the Task Force does not make decisions about measures or actions taken, the volunteer group of experts represents relevant scientific fields and ensures that impartial scientific advice is given.
The members of the Swiss National COVID-19 Science Task Force do not receive any remuneration or compensation for their work in the Task Force. Each member has disclosed any potential conflicts of interest. These documents are available on the Organisation & expert groups page.
Travelers, including Swiss residents, are a sentinel population for SARS-CoV-2 transmission in Switzerland because they arrive from countries that might have higher levels of infection than Switzerland.
Prevention of spread of SARS-CoV-2 in Switzerland in summer 2021, in the context of variants of concern and vaccination
Measures to prevent the spread of SARS-CoV-2 work best in combination and when the number of incident cases is low.
Recent studies have characterized the decay kinetics of SARS-CoV-2 specific B and T cell responses after vaccination or infection. They estimate that neutralizing antibody IgG titers decrease with a half-life of around 100 days, while T cell responses seem to be longer lived with a half-life or around 150 days.
Considerations for an alert system for infectious diseases, focus on COVID-19: a scoping review of tier systems used in other countries and current data.
Many countries and regions around the world use frameworks, known as tier (also known as traffic light, or alert) systems, to respond to changes in the transmission of SARS-CoV-2 (see list of government sources at the end of this document).