NCIt definition : A recombinant human adenoviral (rAd)-based vaccine encoding for the severe acute respiratory
syndrome coronavirus-2 (SARS-CoV-2) spike glycoprotein (SP), with potential immunomodulating
and anti-COVID-19 activities. Gam-COVID-Vac contains two components: a rAd type 26
(rAd26) prime component encoding the SARS-CoV-2 S protein gene and a rAd type 5 (rAd5)
boost component encoding the SARS-CoV-2 S protein gene. Upon intramuscular administration
of the Gam-COVID-Vac, the Ad infects cells and produces SP. The released SP activates
the immune system to induce a humoral and cell-mediated immune response against SARS-CoV-2.
This may prevent SARS-CoV-2 infection and inhibit viral replication. SP, usually found
on the surface of SARS-CoV-2, plays an essential role in the infection pathway of
the SARS-CoV-2 virus.;