in the trial group that received the three-dose regimen. unlike the phase iii trials in cuba, the majority of cases throughout the entire trial were of the delta strain (more than 90% at the time of vaccine evaluation). children and adolescents trials in june 2021, soberana started clinical trials for children and adolescents aged 3–18 from phase i/ii. interventional study the "interventional study" is set both in havana, cuba's capital and santiago de cuba, cuba's second most populous city and in other provinces. on may 6, 2021, the finlay institute of vaccines announced on social media that the following adverse events have been observed: injection site pain (20%), inflammation at the injection site (5%), and general discomfort (5%). authorizations full authorization emergency authorization allowed for travel