Cuban scientists start second phase of Soberana 02 vaccine Cuban scientists start second phase of Soberana 02 vaccine Havana, Dec 22 (Prensa Latina) Cuban scientists started the second phase of clinical trial on the Soberana 02 vaccine on Tuesday, when the first volunteers were vaccinated. Only a few days ago, the Finlay Institute of Vaccines (IFV), leaders of the project of the first anti-Covid-19 vaccine trials in Cuba, said that this second candidate would begin such stage after preliminary positive results. This way, the Soberana 02 candidate becomes the first Latin American vaccine to advance in the studies, experts added. On her Twitter account, IFV Research Director Dagmar Garcia wrote that the vaccination of the first volunteers during the 2nd phase of clinical trials with Soberana 02 has begun.