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Healthcare workers under the microscope: tracking COVID-19 spread and immunity

NCT ID NCT04370119

Knowledge-focused Sponsor: University Medicine Greifswald Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tested over 1,000 healthcare workers for COVID-19 and tracked their antibody levels over time. The goal was to understand how the virus spreads among hospital staff and how the immune system responds. No treatment was given; the focus was on gathering information to guide future prevention and vaccination efforts.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

1,092 people

The number who actually took part.

Started

Apr 2020

Finished

Apr 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Health Care Worker

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. \>= 18 years of age 2. Willing and able to complete a written consent form 3. Willing to have blood samples stored for future research 4. Healthcare worker employed at Greifswald University Hospital Exclusion Criteria: 1. \< 18 years of age 2. Decline to participate

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Conditions

The condition(s) this trial relates to.

COVID-19

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

SARS-CoV-2

Contacts and locations

Locations

  • Greifswald University Medicine

    Greifswald, Germany

More trials for these conditions

Other studies related to the condition(s) this trial covers.