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Correlation Study of Isotype Switching and Neutralizing Capacity to the COVID-19 Variants Strain

19. oktober 2021 opdateret af: Wu Jiang, Centers for Disease Control and Prevention, China

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.

Studieoversigt

Status

Aktiv, ikke rekrutterende

Betingelser

Detaljeret beskrivelse

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.

Undersøgelsestype

Observationel

Tilmelding (Faktiske)

150

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Kina
      • Beijing, Kina, 100013
        • Center for Disease Control and Prevention

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år til 59 år (Voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Sandsynlighedsprøve

Studiebefolkning

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.

Beskrivelse

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 37·0℃
  • history of allergy to any vaccine component.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Neutralizing capabilities to variant COVID-19 after primary and booster vaccination
Tidsramme: 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.
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
Tidsramme: 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.
Baseline，After fully vaccinated 1 and 6 months，Within 15 days after booster immunization at an interval of 12 months

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Titer of subclass of IgG at different points in time after booster vaccination
Tidsramme: 0,3,7,10,14 days
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

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Centers for Disease Control and Prevention, China

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

20. juli 2020

Primær færdiggørelse (Faktiske)

10. oktober 2021

Studieafslutning (Forventet)

30. oktober 2021

Datoer for studieregistrering

Først indsendt

19. oktober 2021

Først indsendt, der opfyldte QC-kriterier

19. oktober 2021

Først opslået (Faktiske)

21. oktober 2021

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

21. oktober 2021

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

19. oktober 2021

Sidst verificeret

1. oktober 2021

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • BJCDCWJ202102

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

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