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Long Term Persistence and Effect of a Booster Dose of the Japanese Encephalitis Vaccine IC51

5. februar 2014 opdateret af: Valneva Austria GmbH
The study investigates the long term persistence the Japanese encephalitis vaccine IC51 and the need of a booster dose

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

This is an open label, non-randomized multi-center phase 3 follow-up study. All volunteers having completed trial IC51-304 (NCT00595790) will be enrolled into this trial at 2 sites

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

349

Fase

  • Fase 3

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 og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • At least 18 years of age
  • Written informed consent obtained prior to study entry
  • Subjects correctly included in and having completed study IC51-304 according to the protocol.

Exclusion Criteria:

  • Use of any other investigational or non-registered drug or vaccine in addition to the study vaccine during the study period
  • Immunodeficiency including post-organ-transplantation or immunosuppressive therapy
  • Pregnancy, lactation or unreliable contraception in female subjects

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Forebyggelse
  • Tildeling: N/A
  • Interventionel model: Enkelt gruppeopgave
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Andet: IC51
In study IC51-305, subjects who had received IC51 in study IC51-304 were tested for seroconversion 6 months after the first vaccination. Subjects who had protective titers were again tested for persistence of immunity at 12 months after the first immunization,whereas subjects who had titers below the seroconversion threshold by Month 6 received a booster dose of 1x6 mcg IC51 at Month 11. Their immune response was also assessed at Month 12. Thereafter, subjects who had no protective titer by Month 12 received a booster dose of 1x6 mcg IC51 at Month 23, regardless of prior treatment; and neutralizing antibody titers were reassessed at Month 24. Subjects who had protective titers at month 12 did not receive a booster at Month 23, and their neutralizing antibody titer was also assessed at Month 24.
Biologisk: IC51
Andre navne:
  • Japansk encephalitis oprenset inaktiveret vaccine

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Long Term Immunogenicity of IC51 Vaccine 24 Months After the Primary Vaccination
Tidsramme: - 24 months

Seroprotection rate (SPR) (anti-JEV neutralizing antibody titer ≥ 1:10) 24 months (M24) after the primary vaccination - imputed; Persistence of immunogenicity (SPR) at M24 defined as:

  • pos. (positive) (persistent): Subjects

    • with a non-missing, pos. seroconversion at D56 (Study IC51-304) and
    • without booster at M11 or M23 and
    • with non-missing, seroprotection (SP) pos. PRNT50 at M6 or M12 and
    • with non-missing, SP pos. PRNT50 at M24

  • neg. (negative) (non-persistent): Subjects with

    • missing or neg. seroconversion at D56 (Study IC51-304) or
    • booster at M11 or at M23, or
    • non-missing, SP neg. PRNT50 at M6 or M12 or
    • missing PRNT50 at both M6 and M12 or
    • missing or SP neg. PRNT50 (serum dilution giving 50% reduction in plaques in a Plaque Reduction Neutralization Test) at M24
- 24 months

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
SPR 24 Months After the Primary Vaccination (Observed)
Tidsramme: 24 months

Persistence of immunogenicity (SPR) at M24 (observed) defined as :

  • positive (persistent): Subjects

    • with a non-missing, positive seroconversion at D56 (Study IC51-304), and
    • who did not receive a booster dose at Visit 2 (M11) or Visit 4 (M23), and
    • with a non-missing, SP positive PRNT50 result at Visit 1 (M6) or Visit 3 (M12), and
    • with a non-missing, SP positive PRNT50 result at Visit 5 (M24)

  • negative (non-persistent): Subjects

    • with missing or negative seroconversion at D56 (Study IC51-304), or
    • who did receive a booster dose at Visit 2 (M11) or at Visit 4 (M23), or
    • with a non-missing, SP negative PRNT50 result at Visit 1 (M6) or Visit 3 (M12), or
    • with a missing PRNT50 result at both Visit 1 (M6) and Visit 3 (M12), or
    • with a non-missing, SP negative PRNT50 result at Visit 5 (M24)
24 months
Persistent and Actual SPR 6, 12 and 24 Months After Primary Vaccination
Tidsramme: - 24 months
- 24 months
Persistent and Actual GMT 6, 12 and 24 Months After Primary Vaccination
Tidsramme: 24 months
24 months
SCR 1 Month After the Booster Doses
Tidsramme: 1 month
1 month
GMT 1month After Booster Doses
Tidsramme: 1 month
1 month
Safety Profile of IC51
Tidsramme: study duration
study duration

Samarbejdspartnere og efterforskere

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

Sponsor

Valneva Austria GmbH

Efterforskere

  • Studieleder: Susanne Eder, Valneva Austria GmbH

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

1. oktober 2005

Primær færdiggørelse (Faktiske)

1. september 2007

Studieafslutning (Faktiske)

1. april 2009

Datoer for studieregistrering

Først indsendt

4. januar 2008

Først indsendt, der opfyldte QC-kriterier

4. januar 2008

Først opslået (Skøn)

16. januar 2008

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Skøn)

7. marts 2014

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

5. februar 2014

Sidst verificeret

1. februar 2014

Mere information

Begreber relateret til denne undersøgelse

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • IC51-305

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 .

Kliniske forsøg med Japansk encephalitis

Kliniske forsøg med IC51

Søg i lignende forsøg

Sponsorer og samarbejdspartnere

Medicinske tilstande

Narkotikainterventioner

CROs by country

CROs in Israel

Betingelser

Sjældne sygdomme

Narkotikainterventioner

Kosttilskud

Sponsor / samarbejdspartnere

Placeringer

3
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