Abstract:
BACKGROUND:FP-01.1 is a novel synthetic influenza A vaccine consisting of six fluorocarbon-modified 35-mer peptides that encapsulate multiple CD4+ and CD8+ T-cell epitopes and is designed to induce an immune response across a broad population. METHODS:FP-01.1 was evaluated for safety and immunogenicity in a randomised, double-blind, placebo-controlled, dose-escalation, phase I clinical study in healthy adult volunteers (n=49). IFNγ ELISpot assays and multicolour flow cytometry were used to characterise the immune response. RESULTS:FP-01.1 was safe and well tolerated at all doses tested with a similar adverse event profile in actively vaccinated subjects compared with controls. Maximum immunogenicity was in the 150 μg/peptide dose group where a robust response (243 spots/million PBMC) was demonstrated in 75% subjects compared with 0% in placebo controls. All six peptides were immunogenic. FP-01.1 induced dual CD4+ and CD8+ T cell responses and vaccine-specific T cells cross-recognise divergent influenza strains. CONCLUSIONS:This first-in-human study showed that FP-01.1 has an acceptable safety and tolerability profile and generated robust anti-viral T cell responses in a high proportion of subjects tested. The results support the further clinical testing of FP-01.1 prior to clinical, proof-of-concept, live viral challenge studies.
journal_name
Vaccinejournal_title
Vaccineauthors
Francis JN,Bunce CJ,Horlock C,Watson JM,Warrington SJ,Georges B,Brown CBdoi
10.1016/j.vaccine.2014.06.006subject
Has Abstractpub_date
2015-01-03 00:00:00pages
396-402issue
2eissn
0264-410Xissn
1873-2518pii
S0264-410X(14)00795-6journal_volume
33pub_type
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