# Current and Past SARS-CoV-2 Infection and COVID-19 in Healthcare With Regard to Vaccinations

> **NCT04853004** · — · ACTIVE_NOT_RECRUITING · sponsor: **Karolinska Institutet** · enrollment: 10000 (estimated)

## Conditions studied

- SARS-CoV 2

## Interventions

- **DIAGNOSTIC_TEST:** SARS-CoV2 antibody measurement

## Key facts

- **NCT ID:** NCT04853004
- **Lead sponsor:** Karolinska Institutet
- **Sponsor class:** OTHER
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** ACTIVE_NOT_RECRUITING
- **Start date:** 2021-04-01
- **Primary completion:** 2023-03-31
- **Final completion:** 2025-12-31
- **Target enrollment:** 10000 (ESTIMATED)
- **Last updated:** 2025-03-20

## Collaborators

- [object Object]

## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04853004

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04853004, "Current and Past SARS-CoV-2 Infection and COVID-19 in Healthcare With Regard to Vaccinations". Retrieved via AI Analytics 2026-06-08 from https://api.ai-analytics.org/clinical/NCT04853004. Licensed CC0.

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