The Gamaleya National Research Center of Epidemiology and Microbiology (Gamaleya Center) and the Russian Direct Investment Fund (RDIF, Russia’s sovereign wealth fund, investor in Sputnik V and Sputnik Light coronavirus vaccines), announced January 20, 2022 a unique independent comparative study conducted at the National Institute for Infectious Diseases Lazzaro Spallanzani (Italy) by a joint team of researchers of the Institute and the Gamaleya Center showing that 2 doses of Sputnik V provide more than 2 times higher geometric mean titers (GMT) of virus neutralizing antibodies to the Omicron variant of COVID than 2 doses of Pfizer vaccine (2.1 times higher in total and 2.6 times higher 3 months after vaccination).
An article by a team of 12 Italian and 9 Russian scientists led by Francesco Vaia, Director of the Spallanzani Institute and Alexander Gintsburg, Director of the Gamaleya Center, has been published in medRxiv (the preprint server for health sciences) and is available at: https://www.medrxiv.org/content/10.1101/2022.01.15.22269335v1
The study was conducted in Spallanzani Institute in the equal laboratory conditions at the Italian Spallanzani Institute on comparable groups of sera from individuals vaccinated with Sputnik V and Pfizer, with no statistically significant difference in neutralizing activity against Wuhan variant.
The advantages of Sputnik V are the use of native S glycoprotein (spike protein without proline-stabilization and other modifications) and the use of a heterologous prime-boost vaccination regimen. The Pfizer vaccine utilizes the spike protein in a proline-stabilized form in contrast to Sputnik V. Proline-stabilization and other modifications may move an immune response predominantly to the actively mutating receptor-binding domain (RBD) of spike protein. In the Omicron variant, a substantial number of mutations were registered precisely in RBD, which is why such a significant drop in neutralizing activity against this variant may be observed in the sera of Pfizer-vaccinated.
Alexander Gintsburg, Director of the National Research Center for Epidemiology and Microbiology, said:
The joint study by the Gamaleya Center and Spallanzani Institute confirmed the results obtained in our separate study published in December 2021. The hard scientific data proves Sputnik V has higher virus neutralizing activity against Omicron as compared to other vaccines and will play a major role in the global fight against this new contagious variant.
Denis Logunov, Deputy Director of the National Research Center for Epidemiology and Microbiology, noted:
The Spallanzani Institute is one of the leading European research centers and our joint study provided a unique opportunity for independent analysis of different vaccine platforms against Omicron. Adenoviral vector platform in the core of Sputnik V and Sputnik Light vaccines once again proved to be the best solution in creating strong and durable immunity against COVID and its new variants.
Kirill Dmitriev, CEO of the Russian Direct Investment Fund, commented:
Results of the study in Italy confirm Sputnik V offers the strongest protection against Omicron. The adenoviral platform has shown high efficacy in fighting mutations of COVID previously. Partnership of different platforms is the key and heterologous (“mix & match”) boosting with Sputnik Light will help strengthen efficacy of other vaccines in light of combined Delta and Omicron challenge.