Do winter viruses block each other or make illness worse?
NCT ID NCT07805590
First seen Sep 04, 2026 · Last updated Sep 04, 2026
Summary
This study examines virus-virus interactions among patients admitted to Lyon hospitals during the winters of 2022 to 2025. Researchers will analyze routine PCR test results to see which respiratory viruses are found together more or less often than expected. The goal is to understand whether co-infections are linked to more severe illness, especially in children, who show higher rates of co-infection.
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
- This research could clarify how respiratory viruses interact, potentially guiding better management of co-infections and informing vaccination strategies.
- What could go wrong
- This is an observational analysis of existing data, so it cannot prove cause and effect. Findings may not apply beyond the specific hospital population or winters studied.
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Study facts
What this study's own registry entry says, in plain language.
- Participants
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About 114,230 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Jan 2026
- Expected to finish
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Dec 2026
An estimate. End dates often move.
- Lead sponsor
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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
Virologic results for biological samples collected as part of the diagnosis of respiratory viral infections in patients of all ages receiving routine care, regardless of their department of origin, during the winter periods from 2022 to 2025.
- Ages
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Children (under 18), adults (18 to 64) and older adults (65 and over)
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide 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: * \- Any virological result (positive or negative) following a biological sample taken as part of routine care within the HCLs for the purpose of diagnosing a respiratory infection in a hospitalised patient. * Patients of any age * Samples taken during the winter periods between 2022 and 2025. Exclusion Criteria: * na
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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Infective Agents Institute, Croix rousse Hospital
RECRUITINGLyon, Rhone, 69004, France
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