Twitter restricts "first registered vaccine against COVID-19," Sputnik Vaccine's account: Sputnik Vaccine, the Moscow-based COVID-19 vaccine that was reportedly the "first registered" COVID vaccine, had its Twitter account restricted. When attempting to go to the Twitter account, @sputnikvaccine, users see a message that says "Caution: This account is temporarily restricted. You're seeing this warning because there has been some unusual activity from this account. Do you still want to view it?" Users may then click "Yes, view profile" to proceed to the page. The account owners do not know what has led to this action.