Skip to content

Corona Immunitas: a nationwide program of antibody studies of SARS-CoV-2 in the Swiss population

Seroprevalence of SARS-CoV-2 antibodies and development of immunity in the Swiss population – Multicenter population-based observational studies to inform policy making

Status
Active, not recruiting
Phases
Unknown
Study type
Observational
Source
ISRCTN
Registry ID
ISRCTN18181860
Enrollment
25000
Registered
2020-07-13
Start date
2020-04-01
Completion date
Unknown
Last updated
2026-08-10

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

SARS-CoV2 infection (COVID-19) Infections and Infestations

Interventions

Potential participants are either randomly selected from the general population or selected from specific sub-population settings. The process of enrollment is organized by each study center and for e

Sponsors

Swiss School of Public Health
Lead Sponsor

Eligibility

Inclusion criteria

Inclusion criteria: 1. No acute SARS-CoV-2 infection: no presence of symptoms for at least 48 hours 2. In case of a SARS-CoV-2 infection verified by a RT-PCR test, the earliest inclusion is 21 days after the test date

Exclusion criteria

Exclusion criteria: 1. No informed consent 2. Suspicion of acute COVID-19 infection

Design outcomes

Primary

MeasureTime frame
Seroprevalence of SARS-CoV-2 antibodies measured using peripheral blood sample by venipuncture in the general population and in specific subpopulations at repeated time points during the epidemic in Switzerland

Secondary

MeasureTime frame
1. Presence of symptoms suggestive of a common cold, influenza and similar upper respiratory tract infections prior to the first study visit. Measured by baseline questionnaire (at baseline) 2. Potential risk factors and preventive measures for SARS-CoV-2 infection (exposure, socio-economic factors, adherence to general hygiene and physical distancing rules, utilization of mask and gloves). Measured by baseline questionnaire (at baseline) 3. Incidence of self-reported symptoms and SARS-CoV-2 infections after the first study visit in initially seropositive individuals (extent and duration of immunity after infection with SARS-CoV-2). Measured by digital follow-up questionnaire (weekly) 4. Proportion of seronegative individuals of the first investigation wave who will self-report symptoms and infection with SARS-CoV-2. Measured by digital follow-up questionnaire (weekly) 5. Course over time in access to health care, health care renunciation, going outside (frequency, reason, physical activity), preventive measures with respect to COVID-19. Measured by digital follow-up questionnaire (weekly and monthly) 6. Course over time in mental well-being, specifically stress, anxiety and depression. Measured by digital follow-up questionnaire (monthly)

Countries

Switzerland

Contacts

Public ContactJan Fehr
jan.fehr@uzh.ch+41 44 634 46 79

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Aug 25, 2026