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Open AccessArticle

Safety and Immunogenicity of a Novel Recombinant Simian Adenovirus ChAdOx2 as a Vectored Vaccine

The Jenner Institute, University of Oxford, ORCRB, Roosevelt Drive, Oxford OX3 7DQ, UK
Clinical BioManufacturing Facility, Churchill Hospital, University of Oxford, Oxford OX3 7JT, UK
Department of Nutritional Sciences, Faculty of Life Sciences & Medicine, Franklin Wilkins Building, King’s College London, London SE1 9NH, UK
Author to whom correspondence should be addressed.
Vaccines 2019, 7(2), 40;
Received: 11 March 2019 / Revised: 30 April 2019 / Accepted: 8 May 2019 / Published: 15 May 2019
PDF [1802 KB, uploaded 13 June 2019]


Adenovirus vectored vaccines are a highly effective strategy to induce cellular immune responses which are particularly effective against intracellular pathogens. Recombinant simian adenovirus vectors were developed to circumvent the limitations imposed by the use of human adenoviruses due to widespread seroprevalence of neutralising antibodies. We have constructed a replication deficient simian adenovirus-vectored vaccine (ChAdOx2) expressing 4 genes from the Mycobacterium avium subspecies paratuberculosis (AhpC, Gsd, p12 and mpa). Safety and T-cell immunogenicity results of the first clinical use of the ChAdOx2 vector are presented here. The trial was conducted using a ‘three-plus-three’ dose escalation study design. We demonstrate the vaccine is safe, well tolerated and immunogenic. View Full-Text
Keywords: viral vector; vaccine; T-cell; Mycobacterium avium subsp. paratuberculosis viral vector; vaccine; T-cell; Mycobacterium avium subsp. paratuberculosis

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Folegatti, P.M.; Bellamy, D.; Roberts, R.; Powlson, J.; Edwards, N.J.; Mair, C.F.; Bowyer, G.; Poulton, I.; Mitton, C.H.; Green, N.; Berrie, E.; Lawrie, A.M.; Hill, A.V.; Ewer, K.J.; Hermon-Taylor, J.; Gilbert, S.C. Safety and Immunogenicity of a Novel Recombinant Simian Adenovirus ChAdOx2 as a Vectored Vaccine. Vaccines 2019, 7, 40.

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