RSV returns with a vengeance after COVID lockdowns
NCT ID NCT04959734
First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study tracks RSV (respiratory syncytial virus) in UK children under 2, after COVID-19 disrupted normal seasonal patterns. Researchers are monitoring when RSV appears, how severe it is, and whether older children are affected. The goal is to help hospitals prepare for surges and protect high-risk infants.
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 could help predict and prepare for RSV surges, protecting at-risk children through timely immunisation.
- What could go wrong
- This is an observational study, not a treatment trial. Results may not apply to other countries or future seasons.
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
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About 3,000 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Jun 2021
- Expected to finish
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Mar 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
Children under two years of age attending emergency departments across the UK and Ireland
- Ages
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0 to 2 years
- 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: i) Children under two years of age presenting to participating emergency departments with clinical features of: * Bronchiolitis (cough, tachypnoea or chest recession, and wheeze or crackles on chest auscultation) or * Lower Respiratory Tract infection or * Afirst episode of acute viral wheeze. Exclusion Criteria: i) Children with previous episodes of wheeze responsive to bronchodilator (suggesting an underlying diagnosis of recurrent wheeze of early childhood)
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Get notified about this study
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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.
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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University Hospitals of Leicester NHS Trust
RECRUITINGLeicester, United Kingdom