COVID-19 Clinical Trial
Official title:
Study on the Correlation of Isotype Switching, Neutralizing Antibody Titer and Cross Immunity Against COVID-19 Variants After Primary and Booster Vaccination
Verified date | October 2021 |
Source | Centers for Disease Control and Prevention, China |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Observational |
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.
Status | Active, not recruiting |
Enrollment | 150 |
Est. completion date | October 30, 2021 |
Est. primary completion date | October 10, 2021 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 18 Years to 59 Years |
Eligibility | Inclusion Criteria: - Between the ages of 18 and 59 - Healthy - No vaccination with COVID-19 before become participant - Agreed to take a blood sample Exclusion Criteria: - 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 37ยท0? - history of allergy to any vaccine component. |
Country | Name | City | State |
---|---|---|---|
China | Center for Disease Control and Prevention | Beijing |
Lead Sponsor | Collaborator |
---|---|
Centers for Disease Control and Prevention, China |
China,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | 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. |
Baseline,After fully vaccinated 1 and 6 months,Within 15 days after booster immunization at 12 months | |
Primary | 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. | Baseline,After fully vaccinated 1 and 6 months,Within 15 days after booster immunization at an interval of 12 months | |
Secondary | 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. | 0,3,7,10,14 days |
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