Durable protection against the SARS-CoV-2 Omicron variant is induced by an adjuvanted subunit vaccine

Author:

Arunachalam Prabhu S.1ORCID,Feng Yupeng1ORCID,Ashraf Usama2ORCID,Hu Mengyun1ORCID,Walls Alexandra C.34ORCID,Edara Venkata Viswanadh5ORCID,Zarnitsyna Veronika I.6ORCID,Aye Pyone Pyone7,Golden Nadia7ORCID,Miranda Marcos C.38ORCID,Green Kristyn W. M.7ORCID,Threeton Breanna M.7,Maness Nicholas J.7ORCID,Beddingfield Brandon J.7ORCID,Bohm Rudolf P.7ORCID,Scheuermann Sarah E.7ORCID,Goff Kelly7ORCID,Dufour Jason7,Russell-Lodrigue Kasi7,Kepl Elizabeth38ORCID,Fiala Brooke38ORCID,Wrenn Samuel38,Ravichandran Rashmi38ORCID,Ellis Daniel38ORCID,Carter Lauren38ORCID,Rogers Kenneth9ORCID,Shirreff Lisa M.9ORCID,Ferrell Douglas E.9ORCID,Deb Adhikary Nihar R.9ORCID,Fontenot Jane9ORCID,Hammond Holly L.10,Frieman Matthew10ORCID,Grifoni Alba11ORCID,Sette Alessandro1112ORCID,O’Hagan Derek T.13,Van Der Most Robbert14ORCID,Rappuoli Rino15ORCID,Villinger Francois9ORCID,Kleanthous Harry16ORCID,Rappaport Jay717,Suthar Mehul S.5ORCID,Veesler David34ORCID,Wang Taia T.218ORCID,King Neil P.38ORCID,Pulendran Bali11819ORCID

Affiliation:

1. Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Stanford, CA 94305, USA.

2. Department of Medicine, Division of Infectious Diseases, Stanford University, Stanford, CA 94305, USA.

3. Department of Biochemistry, University of Washington, Seattle, WA 98195, USA.

4. Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195, USA.

5. Department of Pediatrics, Emory Vaccine Center, Emory National Primate Research Center, and Emory University School of Medicine, Atlanta, GA 30329, USA.

6. Department of Microbiology and Immunology, Emory University, Atlanta, GA 30329, USA.

7. Tulane National Primate Research Center, Covington, LA 70433, USA.

8. Institute for Protein Design, University of Washington, Seattle, WA 98195, USA.

9. New Iberia Research Center, University of Louisiana at Lafayette, New Iberia, LA 70560, USA.

10. Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD 21201, USA.

11. Department of Medicine, Division of Infectious Diseases and Global Public Health, University of California, San Diego, La Jolla, CA 92037, USA.

12. Center for Infectious Disease and Vaccine Research, La Jolla Institute for Immunology, La Jolla, CA 92037, USA.

13. GSK, Rockville, MD 20850, USA.

14. GSK, Rixensart 1330, Belgium.

15. GSK, Siena 53100, Italy.

16. Bill and Melinda Gates Foundation, Seattle, WA 98109, USA.

17. Department of Microbiology and Immunology, Tulane University School of Medicine, New Orleans, LA 70112, USA.

18. Department of Microbiology and Immunology, School of Medicine, Stanford University, Stanford, CA 94305, USA.

19. Department of Pathology, School of Medicine, Stanford University, Stanford, CA 94305, USA.

Abstract

Despite the remarkable efficacy of COVID-19 vaccines, waning immunity and the emergence of SARS-CoV-2 variants such as Omicron represents a global health challenge. Here, we present data from a study in nonhuman primates demonstrating durable protection against the Omicron BA.1 variant induced by a subunit SARS-CoV-2 vaccine comprising the receptor binding domain of the ancestral strain (RBD-Wu) on the I53-50 nanoparticle adjuvanted with AS03, which was recently authorized for use in individuals 18 years or older. Vaccination induced neutralizing antibody (nAb) titers that were maintained at high concentrations for at least 1 year after two doses, with a pseudovirus nAb geometric mean titer (GMT) of 1978 and a live virus nAb GMT of 1331 against the ancestral strain but not against the Omicron BA.1 variant. However, a booster dose at 6 to 12 months with RBD-Wu or RBD-β (RBD from the Beta variant) displayed on I53-50 elicited high neutralizing titers against the ancestral and Omicron variants. In addition, we observed persistent neutralization titers against a panel of sarbecoviruses, including SARS-CoV. Furthermore, there were substantial and persistent memory T and B cell responses reactive to Beta and Omicron variants. Vaccination resulted in protection against Omicron infection in the lung and suppression of viral burden in the nares at 6 weeks after the final booster immunization. Even at 6 months after vaccination, we observed protection in the lung and rapid control of virus in the nares. These results highlight the durable and cross-protective immunity elicited by the AS03-adjuvanted RBD-I53-50 nanoparticle vaccine.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

General Medicine

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