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How many kids had COVID? new study counts antibodies

NCT ID NCT04355533

Knowledge-focused Sponsor: Assistance Publique - Hôpitaux de Paris 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 children and their parents for COVID-19 antibodies to find out how many had been infected. Researchers also checked for active virus in nose, saliva, and stool samples. The goal was to better understand infection rates and immune responses in families.

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.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

1,056 people

The number who actually took part.

Started

Jul 2020

Finished

May 2022

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.

Ages

7 days and older

Sex

Anyone

Healthy volunteers

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

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

Inclusion Criteria: For hospitalized children or consulting at hospital * any child over 7 days old and under 17 years old in consultation or hospitalized for at most 4 days at AP-HP or CH Cayenne; Or any child over 7 days old and under 17 years old with a positive PCR at home, with an attending physician in a participating centre * Parent's agreement for blood, saliva and stool samples * Optional parent's agreement for nasopharynx swab * Optional parent's agreement for follow-up if PCR+ * With an Health insurance For children with potential COVID disease during the first wave * Any child over 7 days old and under 17 years, seropositive during the first wave * Or any child over 7 days old and under 17 years, with a previous inflammatory clinical disease potentially linked to SARS-cov2 * With an Health insurance Parent of the enrolled child * One parent of the enrolled child on ped-covid * Agreement for blood and saliva samples * Optional agreement for nasopharynx swab * Optional parent's agreement for follow-up if PCR+ * With an Health insurance For children SARS-coV2 positive * any child less then 18 years old * infected by SARS-coV2 * Parent's agreement for blood, saliva samples * Optional parent's agreement for nasopharynx swab * With health insurance For people living under the same roof of a child included in the study * any child or adult living under the same roof of a child SARS-coV2 positive and included in the study * With health insurance Exclusion Criteria: For hospitalized children or consulting at hospital * child younger than 7 days * Refusal of parent * Refusal of child * No health insurance

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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.

COVID-19 infection

Contacts and locations

Locations

  • Hôpital necker Enfants-Malades

    Paris, 75015, France

More trials for these conditions

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