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OA-023
ONE-YEAR SAFETY OF THE RVSV∆G-ZEBOV-GP VACCINE IN ADOLESCENTS AND CHILDREN IN LAMBARENE, GABON
  1. Bache Emmanuel Bache1,
  2. José F. Fernandes1,2,
  3. Régis M Obiang Mba1,
  4. Anita L. Kabwende1,
  5. Martin P. Grobusch1,2,3,
  6. Sanjeev Krishna1,2,4,
  7. Peter G. Kremsner1,2,
  8. Agnandji Selidji Todagbe1,2
  1. 1Centre de Recherches Médicales de Lambaréné (CERMEL), Lambaréné, Gabon
  2. 2Institut für Tropenmedizin, Universitätsklinikum Tübingen, Germany
  3. 3Centre of Tropical Medicine and Travel Medicine, Department of Infectious Diseases, Division of Internal Medicine, Academic Medical Centre, Amsterdam, The Netherlands
  4. 4Institute for Infection and Immunity, St. George's, University of London, UK

Abstract

Background The rVSV∆G-ZEBOV-GP vaccine was safe and immunogenic in American, European and African adults. Few cases of transient, self-limiting arthritis have been reported in some adult participants in Geneva. We describe one-year safety of a single dose (2×107 plaque forming unit (PFU)) of the vaccine administered to adolescents and children living in Lambaréné.

Methods A phase I, open label randomized trial conducted in Lambaréné, Gabon, to assess the clinical safety (adverse events (local/systemic symptoms, and laboratory anomalies)) for 365 days' post injection. The primary objective was to assess the nature, frequency, and severity of adverse events (AEs) and/or serious adverse events (SAEs) associated with the administration of the vaccine.

Results From 08-May 2015 to 07-Jul-2015, a total of 20 adolescents and 20 children aged 13–17 and 6–12 years respectively, were vaccinated with a single intramuscular dose of 2×107 PFU rVSV∆G-ZEBOV-GP vaccine. Two serious adverse events (SAE) were reported over one year of follow-up. Two adolescents were hospitalized for Plasmodium falciparium malaria and pneumonia infection. Up to 12 months' (6 months of extended follow-up) of both active and passive reporting, the most frequently reported symptoms by vaccinees are classified under the following system organ classes (SOC): Gastrointestinal disorders 30%(6/20) and 40%(8/20), respiratory-thoracic and mediasternal disorders 5%(1/20) and 45%(9/20), and infections/infestations 20%(4/20) and 20%(4/20) for adolescents and children respectively. No case of arthritis was observed, few cases 13%(5/40) of mild to moderate arthralgia, unrelated to the vaccine were reported. No delayed reactogenicity symptoms were reported beyond the already mild to moderate intensity symptoms reported during the first 28 days' post injection. No severe (grade 3) adverse event was reported. Median haematology and biochemistry values were within site normal ranges at month 12.

Conclusion The vaccine dose of 2×107 PFU showed an acceptable safety and tolerability profile in our volunteers' age 6–17 years, living in a setting endemic for Ebola virus transmission. This acceptable safety profile seen in adolescents and children is similar to that previously reported in adults.

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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