The use of two vectors is the unique technology, developed by the Gamaleya Center scientists, which differentiates the Russian vaccine from other adenoviral vector-based vaccines under development around the world. Vaccines based on adenoviral vectors also have clear advantages over other technologies such as mRNA vaccines.
Prospective mRNA vaccines, undergoing clinical trials in the United States and other countries, do not use vectors for delivery and represent an RNA molecule with coronavirus protein code wrapped in a lipid membrane. This technology is promising but its side effects, especially an impact on fertility, have not yet been studied in depth. No mRNA vaccine has yet received regulatory approval in the world.