- ICH GCP
- US-Register für klinische Studien
- Klinische Studie NCT01666925
Efficacy of Malaria Vaccines in Kenyan Adults
Efficacy Study of ChAd63MVA ME-TRAP Prime-boost Vaccination Against Plasmodium Falciparum Infection.
Malaria transmission is falling in some parts of Africa as bed nets and anti-malarials become more widely available. However, transmission still persists and it appears that additional control measures are required. The leading malaria vaccine candidate in development is RTS,S which has efficacy against clinical malaria measured at 30-50% in the field. This partial protection might be enhanced by combination with other components. The other vaccination approach that has produced repeatable efficacy in humans is the use of viral vectors to induce T cell responses. Previous attempts with this vaccine approach have been effective in challenge studies in Oxford, but ineffective in the field, probably because of reduced immunogenicity.
Recently, studies in Oxford, Kenya and the Gambia have shown higher levels of immunogenicity by using a chimpanzee adenovirus (ChAd63) followed by an attenuated vaccinia virus (modified vaccinia Ankara) to deliver the pre-erythrocytic antigen, multiple epitope string with thrombospondin- related adhesion protein (ME-TRAP).
The increase in immunogenicity has lead to sterile protection in 3 out of 14 volunteers and partial protection in 5 out of 14 volunteers in challenge studies.
The investigators propose a Phase 2b study of 120 healthy adult men in Kenya. The investigators will assess the efficacy and further evaluate the immunogenicity and safety profile of the vaccine regimen. The investigators also intend to assess the correlates of efficacy and natural immunity.
Studienübersicht
Status
Bedingungen
Intervention / Behandlung
Studientyp
Einschreibung (Tatsächlich)
Phase
- Phase 2
Kontakte und Standorte
Studienorte
-
-
-
Kilifi, Kenia, PO Box 230, 80108
- KEMRI/Wellcome Trust Programme, Centre for Geographic Medicine Research - Coast
-
-
Teilnahmekriterien
Zulassungskriterien
Studienberechtigtes Alter
Akzeptiert gesunde Freiwillige
Studienberechtigte Geschlechter
Beschreibung
Inclusion Criteria:
- Consenting adult males aged 18 - 50 years in good health.
- Will remain resident in the study area for the study duration.
- Able and willing (in the Investigator's opinion) to comply with all study requirements
- Informed Consent
Exclusion Criteria:
- Any significant medical disease, disorder or finding which may significantly increase the risk to the volunteer because of participation in the study, affect the ability of the volunteer to participate in the study or impair interpretation of the study data
- Hypersensitivity to Verorab, the trial vaccines or the antimalarial used.
- History of allergic disease or reactions likely to be exacerbated by any component of the vaccines, e.g. egg products, kathon, neomycin
- History of splenectomy.
- Haemoglobin less than 10.0 g/dl
- Clinically significant abnormalities of laboratory screening tests (full blood count, ALT, creatinine levels).
- Blood transfusion within the month preceding enrolment.
- History of vaccination with previous experimental malaria vaccines or other vaccines likely to impact on findings of study (e.g. other MVA or adenovirus vectored vaccines)
- Administration of any other vaccine or immunoglobulin within 2 weeks before vaccination.
- HIV or Hepatitis B surface antigen seropositivity.
- Current participation in another clinical trial or recent participation within 12 weeks of this study.
- Any other finding which in the opinion of the investigators would increase the risk of an adverse outcome from participation in the trial.
- Likelihood of travel away from the study area
Studienplan
Wie ist die Studie aufgebaut?
Designdetails
- Hauptzweck: Verhütung
- Zuteilung: Zufällig
- Interventionsmodell: Parallele Zuordnung
- Maskierung: Single
Waffen und Interventionen
Teilnehmergruppe / Arm |
Intervention / Behandlung |
---|---|
Experimental: ChAd63 ME-TRAP and MVA ME-TRAP
ChAd63 ME-TRAP / MVA ME-TRAP heterologous prime-boost immunisation
|
ChAd63 ME-TRAP: 5 x 10^10vp MVA ME-TRAP: 2 x 10^8 pfu
|
Aktiver Komparator: Rabies vaccine
2 x 2.5IU Verorab
|
2 x 2,5 IE Verorab
Andere Namen:
|
Was misst die Studie?
Primäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
---|---|---|
Vaccine Efficacy
Zeitfenster: 18 weeks
|
The first episode of P.falciparum infection positive by PCR, for P.falciparum.
|
18 weeks
|
Sekundäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
---|---|---|
Vaccine immunogenicity
Zeitfenster: 24 weeks
|
Measures of immunogenicity will include: Ex vivo ELISPOT responses to overlapping pools of ME - TRAP peptides. Cultured ELISPOT responses to overlapping pools of ME - TRAP peptides. ICS by flow cytometry for cell mediated immune responses ELISA for antibodies to malaria antigens |
24 weeks
|
Reactogenicity
Zeitfenster: 24 weeks
|
All solicited and unsolicited local and systemic vaccine- linked adverse events (AEs) including clinically significant laboratory abnormalities.
|
24 weeks
|
Mitarbeiter und Ermittler
Studienaufzeichnungsdaten
Haupttermine studieren
Studienbeginn
Primärer Abschluss (Tatsächlich)
Studienabschluss (Tatsächlich)
Studienanmeldedaten
Zuerst eingereicht
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst gepostet (Schätzen)
Studienaufzeichnungsaktualisierungen
Letztes Update gepostet (Schätzen)
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Zuletzt verifiziert
Mehr Informationen
Begriffe im Zusammenhang mit dieser Studie
Zusätzliche relevante MeSH-Bedingungen
Andere Studien-ID-Nummern
- VAC046
Diese Informationen wurden ohne Änderungen direkt von der Website clinicaltrials.gov abgerufen. Wenn Sie Ihre Studiendaten ändern, entfernen oder aktualisieren möchten, wenden Sie sich bitte an register@clinicaltrials.gov. Sobald eine Änderung auf clinicaltrials.gov implementiert wird, wird diese automatisch auch auf unserer Website aktualisiert .
Klinische Studien zur Malaria
-
University of California, San FranciscoCenters for Disease Control and Prevention; University of Massachusetts, Amherst und andere MitarbeiterRekrutierungPlasmodium falciparum Malaria | Plasmodium Vivax-MalariaDemokratische Volksrepublik Laos
-
University of OxfordWellcome Trust; Ministry of public Health AfghanistanAbgeschlossenVivax-Malaria | Unkomplizierte Falciparum-MalariaAfghanistan
-
Menzies School of Health ResearchInternational Centre for Diarrhoeal Disease Research, Bangladesh; Addis Ababa... und andere MitarbeiterAbgeschlossenVerringerung des Risikos von P. vivax nach Falciparum-Infektionen in co-endemischen Gebieten (PRIMA)Malaria | Vivax-Malaria | Falciparum-MalariaÄthiopien, Bangladesch, Indonesien
-
Medicines for Malaria VentureAsociacion Civil Selva AmazonicaAbgeschlossenPlasmodium falciparum Malaria | Plasmodium Vivax-MalariaPeru
-
Gadjah Mada UniversityMenzies School of Health Research; Eijkman Institute for Molecular Biology; Timika...AbgeschlossenPlasmodium falciparum Malaria | Plasmodium Vivax-MalariaIndonesien
-
Menzies School of Health ResearchNational Health and Medical Research Council, Australia; Wellcome Trust; National...AbgeschlossenVivax-Malaria | Falciparum-MalariaIndonesien
-
London School of Hygiene and Tropical MedicineWorld Health Organization; United Nations High Commissioner for Refugees; HealthNet... und andere MitarbeiterAbgeschlossenMalaria | Vivax-Malaria | Falciparum-MalariaPakistan
-
Menzies School of Health ResearchNational Health and Medical Research Council, Australia; Wellcome Trust; National...AbgeschlossenVivax-Malaria | Falciparum-MalariaIndonesien
-
Research Institute for Tropical Medicine, PhilippinesWorld Health OrganizationAbgeschlossenMalaria | Vivax-Malaria | Falciparum-Malaria | Malaria-Rückfall
-
University of IbadanShin Poong Pharm Co Ltd 161 yoksam-ro, Gangnam-Gu Seoul 135-925, Korea; Institute...AbgeschlossenPlasmodium falciparum Malaria | Unkomplizierte Malaria | Malaria-FieberNigeria
Klinische Studien zur Tollwut-Impfstoff
-
Panafina, Inc.RekrutierungAkute PankreatitisVereinigte Staaten
-
Maisonneuve-Rosemont HospitalRekrutierung
-
TASK Applied ScienceAbgeschlossenCOVID-19 | SARS-CoV-2Südafrika