COVID-19NCT05087277
Correlation Study of Isotype Switching and Neutralizing Capacity to the COVID-19 Variants Strain
An observational study of COVID-19, run by Centers for Disease Control and Prevention, China at 1 site in China.
Trial summary
The level of neutralizing antibody was detected by using the constructed pseudovirus covid-19 variant at baseline , 1 month , 6 months and 12 months after primary vaccination, within 15 days after booster immunization at 12 months . Read more about this study
- Who is it for?
- Ages 18 to 59 yearsHealthy volunteers can take part
- Conditions the study is for
- COVID-19
- How many people
- 150 participants
- Where
- 1 siteChina
- Study dates
- 20 Jul 2020to 30 Oct 2021
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 59 years
- All sexes
- Healthy volunteers accepted
- Adult
Study population: The healthy people aged between 18 and 59, and have not been infected with COVID-19, have not been vaccinated with COVID-19 vaccine, and agree to collect blood samples.
Who may be able to join
- Between the ages of 18 and 59
- Healthy
- No vaccination with COVID-19 before become participant
- Agreed to take a blood sample
Who cannot join
- who cannot take the COVID-19 vaccine due to some personal reasons
- history of SARS-CoV, SARS-CoV-2, or Middle East respiratory syndrome infection
- high-risk epidemiology history within 14 days before enrolment (eg, travel or residence history in communities with case reports, or contact history with someone infected with SARS-CoV-2)
- axillary temperature of more than 37·0℃
- history of allergy to any vaccine component.
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Study on the Correlation of Isotype Switching, Neutralizing Antibody Titer and Cross Immunity Against COVID-19 Variants After Primary and Booster Vaccination
The level of neutralizing antibody was detected by using the constructed pseudovirus covid-19 variant at baseline , 1 month , 6 months and 12 months after primary vaccination, within 15 days after booster immunization at 12 months . and the ability of IgG subclasses to neutralize and cross immunization of variant strains was analyzed.
Read the detailed description
In 150 individuals who received primary and booster COVID-19 inactivated vaccine, the neutralization ability of antibodies against covid-19 mutant after primary and booster immunization was evaluated by constructing pseudotyped SARS-CoV-2 variants. The contribution and influence of IgG subclasses on neutralization capacity were assessed by Elisa assay. All participants were recruited aged between 18 and 59 years old. Every participant was familiarized with the aim of the study and asked to sign an informed consent agreement and was required blood sampling at the day 0 of first dose vaccine and 1 month, 6 months after 2nd dose of primary immunization. All participants had received 1 dose of booster immunization at 12 months after fully primary vaccination. Then 150 people were divided into four groups, Blood samples were taken on days 0,3,7,10 and 14 to detect neutralizing antibodies and IgG subclasses separately. every sample was detected SARS-CoV-2 variants strain Alpha, Beta and Delta neutralizing antibody, and RBD-IgG1, IgG2, IgG3, and IgG4. every individual was conducted a detailed analysis correlation of isotype switching, neutralizing antibody titer and cross immunity against COVID-19 variants after primary and booster vaccination.
- Conditions
- COVID-19
- Keywords
- cohort study, Isotype Switching, Neutralize antibodies, COVID-19 Variants Strain
- Medical subject headings
- COVID-19
What is being measured
The primary outcome is the main question the study is designed to answer.
Neutralizing capabilities to variant COVID-19 after primary and booster vaccination
The titers of neutralizing antibodies against live SARS-CoV-2 and Pseudotyped SARS-CoV-2 Variants strain Alpha, Beta and Delta at baseline, after fully vaccinated 1 and 6 months and Within 15 days after booster immunization at 12 months.
The neutralizing antibodies was defined as a change from seronegative at baseline to seropositive or a four-fold titer increase. The positive cutoff of the titer for neutralizing antibodies was 1/30.
Measured: Baseline，After fully vaccinated 1 and 6 months，Within 15 days after booster immunization at 12 months
Titer of Subclass of IgG after primary and booster vaccination
The titers of Subclass RBD-specific IgG1, IgG2,IgG3 and IgG4 at baseline, after fully vaccinated 1 and 6 months and Within 15 days after booster immunization at an interval of 12 months. The positive for IgG1, IgG2,IgG3 and IgG4 antibodies are defined as the sample titer value ≥1/20.
Measured: Baseline，After fully vaccinated 1 and 6 months，Within 15 days after booster immunization at an interval of 12 months
Secondary outcomes (1)
Titer of subclass of IgG at different points in time after booster vaccination
Titer of subclass of IgG at 0,3,7,10,14 days after booster vaccination. The positive for IgG1, IgG2,IgG3 and IgG4 antibodies are defined as the sample titer value ≥1/20.
Measured: 0,3,7,10,14 days
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted21 Oct 2021
- Study start20 Jul 2020
- Primary completion10 Oct 2021
- Study completion30 Oct 2021 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for COVID-19Studies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Prospective
- Enrolment
- 150 participants (actual)
Sponsor and investigators
- Lead sponsor
- Centers for Disease Control and Prevention, China
- Sponsor type
- Other government
- Responsible party
- Principal investigator, Wu Jiang, Centers for Disease Control and Prevention, China
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05087277
- Sponsor's protocol ID
- BJCDCWJ202102
- Status last verified
- Oct 2021
- First submitted
- 19 Oct 2021
- Last updated
- 21 Oct 2021
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 21 Oct 2021. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Study on the Correlation of Isotype Switching, Neutralizing Antibody Titer and Cross Immunity Against COVID-19 Variants After Primary and Booster Vaccination
- ClinicalTrials.gov ID
- NCT05087277
- Acronym / sponsor ID
- BJCDCWJ202102
- Conditions
- COVID-19
- Keywords
- cohort study, Isotype Switching, Neutralize antibodies, COVID-19 Variants Strain
- Study type
- Observational
- Recruitment status
- Unknown status
- Enrolment
- 150 participants (actual)
- Lead sponsor
- Centers for Disease Control and Prevention, ChinaOther government
- Study start
- 20 Jul 2020 (actual)
- Primary completion
- 10 Oct 2021 (actual)
- Study completion
- 30 Oct 2021 (estimated)
- First posted
- 21 Oct 2021 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The level of neutralizing antibody was detected by using the constructed pseudovirus covid-19 variant at baseline , 1 month , 6 months and 12 months after primary vaccination, within 15 days after booster immunization at 12 months . and the ability of IgG subclasses to neutralize and cross immunization of variant strains was analyzed.
Detailed description
In 150 individuals who received primary and booster COVID-19 inactivated vaccine, the neutralization ability of antibodies against covid-19 mutant after primary and booster immunization was evaluated by constructing pseudotyped SARS-CoV-2 variants. The contribution and influence of IgG subclasses on neutralization capacity were assessed by Elisa assay. All participants were recruited aged between 18 and 59 years old. Every participant was familiarized with the aim of the study and asked to sign an informed consent agreement and was required blood sampling at the day 0 of first dose vaccine and 1 month, 6 months after 2nd dose of primary immunization. All participants had received 1 dose of booster immunization at 12 months after fully primary vaccination. Then 150 people were divided into four groups, Blood samples were taken on days 0,3,7,10 and 14 to detect neutralizing antibodies and IgG subclasses separately. every sample was detected SARS-CoV-2 variants strain Alpha, Beta and Delta neutralizing antibody, and RBD-IgG1, IgG2, IgG3, and IgG4. every individual was conducted a detailed analysis correlation of isotype switching, neutralizing antibody titer and cross immunity against COVID-19 variants after primary and booster vaccination.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
Who may qualify
- Ages
- 18 to 59 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
- Study population
- The healthy people aged between 18 and 59, and have not been infected with COVID-19, have not been vaccinated with COVID-19 vaccine, and agree to collect blood samples.
Key inclusion criteria (4 listed)
- Between the ages of 18 and 59
- Healthy
- No vaccination with COVID-19 before become participant
- Agreed to take a blood sample
Key exclusion criteria (5 listed)
- who cannot take the COVID-19 vaccine due to some personal reasons
- history of SARS-CoV, SARS-CoV-2, or Middle East respiratory syndrome infection
- high-risk epidemiology history within 14 days before enrolment (eg, travel or residence history in communities with case reports, or contact history with someone infected with SARS-CoV-2)
- axillary temperature of more than 37·0℃
- history of allergy to any vaccine component.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Neutralizing capabilities to variant COVID-19 after primary and booster vaccination
Time frame: Baseline，After fully vaccinated 1 and 6 months，Within 15 days after booster immunization at 12 months
The titers of neutralizing antibodies against live SARS-CoV-2 and Pseudotyped SARS-CoV-2 Variants strain Alpha, Beta and Delta at baseline, after fully vaccinated 1 and 6 months and Within 15 days after booster immunization at 12 months. The neutralizing antibodies was defined as a change from seronegative at baseline to seropositive or a four-fold titer increase. The positive cutoff of the titer for neutralizing antibodies was 1/30.
Titer of Subclass of IgG after primary and booster vaccination
Time frame: Baseline，After fully vaccinated 1 and 6 months，Within 15 days after booster immunization at an interval of 12 months
The titers of Subclass RBD-specific IgG1, IgG2,IgG3 and IgG4 at baseline, after fully vaccinated 1 and 6 months and Within 15 days after booster immunization at an interval of 12 months. The positive for IgG1, IgG2,IgG3 and IgG4 antibodies are defined as the sample titer value ≥1/20.
1 secondary outcome
Titer of subclass of IgG at different points in time after booster vaccination
Time frame: 0,3,7,10,14 days
Results and safety
Results are not available in the source record.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 21 Oct 2021.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of COVID-19, run by Centers for Disease Control and Prevention, China at 1 site in China.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 5 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: status not confirmed, as of the sponsor's last update on 21 Oct 2021. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
Results are not available in the source record.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Neutralizing capabilities to variant COVID-19 after primary and booster vaccination (time frame: Baseline，After fully vaccinated 1 and 6 months，Within 15 days after booster immunization at 12 months). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Oct 2021.