Scientists probe COVID-19's attack on immune cells

NCT ID NCT04401436

Completed Knowledge-focused Sponsor: National Institute of Allergy and Infectious Diseases (NIAID) Source: ClinicalTrials.gov ↗

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

Summary

This study looked at how the virus that causes COVID-19 reduces the number of infection-fighting white blood cells (lymphocytes) in the blood. Researchers collected blood samples and medical records from 240 adults with or recovering from COVID-19. The goal was to learn more about the body's immune response and find clues for future treatments.

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Conditions

The condition(s) this trial relates to.

COVID-19 lymphopenia vascular hemostatic disease

As listed by the trial registrant

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

CORONAVIRUS DISEASE 2019

Contacts and locations

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Locations

MedStar Georgetown University Hospital

Washington D.C., District of Columbia, 20007, United States
MedStar Health Research Institute: Washington Hospital Medical Center

Washington D.C., District of Columbia, 20010, United States
National Institutes of Health Clinical Center

Bethesda, Maryland, 20892, United States