**9. Sputnik light**

It is a new single-dose vaccine based on recombinant replication-deficient adenovirus type 26 (rAd26) vector expressing the spike (S) glycoprotein as an attempt to meet the vaccine demand. The "Sputnik Light" single-dose rAd26 vector-based COVID-19 vaccine has a favorable safety profile and generates significant humoral, and cellular immune responses in both seronegative and seropositive subjects [52].
