Exposed but not sick? study reveals who spreads COVID-19
NCT ID NCT04259892
First seen May 31, 2026 · Last updated Jun 23, 2026 · Updated 3 times
Summary
This study followed 324 people who had close contact with someone confirmed to have COVID-19. Researchers took nose swabs and tracked symptoms for 12 days to see how long the virus could be detected. The goal was to understand how many exposed people become spreaders, even without symptoms.
Disclaimer
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This is a summary of
the original study
.
Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Locations
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Centre Hospitalier Félix Guyon Ile de la Réunion CHU nord
Saint-Denis, 97400, France
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Centre Investigation Clinique 1415 CHRU Tours - Hôpital Bretonneau
Tours, 37000, France
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Centre Investigation Clinique 1417 Hôpital Cochin Bâtiment Lavoisier
Paris, 75679, France
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Centre Investigation Clinique 1433 CHRU de NANCY
Nancy, 54511, France
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Centre d'Investigation Clinique 1403 -CHU Lille
Lille, 59037, France
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Centre d'Investigation Clinique Hôpital Saint Louis
Paris, 75010, France
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Centre d'Investigation Clinique Ile de la Réunion CHU sud
Saint-Pierre, 97448, France
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Centre d'investigation Clinique 1425, Hôpital Bichat Claude Bernard
Paris, 75018, France
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Centre d'investigation clinique 1406 CHU Grenoble
Grenoble, 38043, France
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Centre d'investigation clinique 1414 Service de Pharmacologie clinique CHU Rennes Hôpital Pontchaillou
Rennes, 35033, France
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Centre d'investigation clinique 1432 Hôpital François Mitterrand CHU Bourgogne
Dijon, 21 079, France
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Département maladie infectieux CHU Saint Etienne
Saint-Etienne, 42055, France
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Service de Maladies infectieuses et tropicales Centre hospitalier
Cayenne, 97306, French Guiana
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Service de maladies infectieuses et tropicales Hôpital Jean Minjoz CHRU Besançon
Besançon, 25030, France
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Service des Maladies infectieuses et tropicales, Pôle Spécialités médicales, CHU Pellegrin
Bordeaux, 33076, France
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Service des maladies infectieuses Hôpital Gabriel Montpied CHU de Clermont Ferrand
Clermont-Ferrand, 63000, France
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
What this could lead to
If successful, this study could help health officials better understand how and when people exposed to COVID-19 spread the virus, improving quarantine guidelines.
What could go wrong
This is an observational study, not a treatment trial. It only measures viral shedding and symptoms, so it won't directly lead to a cure or vaccine.
Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.