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Live attenuated recombinant vaccine protects nonhuman primates against Ebola and Marburg viruses

Abstract

Vaccines and therapies are urgently needed to address public health needs stemming from emerging pathogens and biological threat agents such as the filoviruses Ebola virus (EBOV) and Marburg virus (MARV). Here, we developed replication-competent vaccines against EBOV and MARV based on attenuated recombinant vesicular stomatitis virus vectors expressing either the EBOV glycoprotein or MARV glycoprotein. A single intramuscular injection of the EBOV or MARV vaccine elicited completely protective immune responses in nonhuman primates against lethal EBOV or MARV challenges. Notably, vaccine vector shedding was not detectable in the monkeys and none of the animals developed fever or other symptoms of illness associated with vaccination. The EBOV vaccine induced humoral and apparent cellular immune responses in all vaccinated monkeys, whereas the MARV vaccine induced a stronger humoral than cellular immune response. No evidence of EBOV or MARV replication was detected in any of the protected animals after challenge. Our data suggest that these vaccine candidates are safe and highly efficacious in a relevant animal model.

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Figure 1: Immunization, challenge and rechallenge of nonhuman primates.
Figure 2: Viremia levels in nonhuman primates after immunization and challenge.
Figure 3: Humoral immune response in nonhuman primates to ZEBOV and MARV before and after challenge.
Figure 4: Cellular immune response in nonhuman primates before and after challenge with ZEBOV.

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Acknowledgements

The authors thank D. Braun, D. Dick, F. Feldmann and C. Rice for technical assistance and assistance with animal care. We are grateful to G. Nabel, US National Institutes of Health Vaccine Research Center, for support and discussions. The study was supported by a grant from the Canadian Institute of Health Research (CIHR – MOP – 43921) awarded to H.F., Health Canada. The study was supported in part by the Medical Chemical/Biological Defense Research Program, US Army Medical Research and Material Command (project number 04-4-7J-012). Opinions, interpretations, conclusions and recommendations are those of the authors and are not necessarily endorsed by the US Army.

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Correspondence to Heinz Feldmann.

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Jones, S., Feldmann, H., Ströher, U. et al. Live attenuated recombinant vaccine protects nonhuman primates against Ebola and Marburg viruses. Nat Med 11, 786–790 (2005). https://doi.org/10.1038/nm1258

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