Will boosters be needed after the vaccine?

Even those who have received the two doses of the Covid-19 vaccine should continue to maintain hygiene and distance measures, mainly to protect others, authorities indicate. This is because they could carry the virus and spread it to someone who is not immunized. An infected person is likely to develop a mild or asymptomatic version of the coronavirus as seen with the president of Argentina, Alberto Fernández. And in the face of the new variants, science tells us that laboratories are evaluating whether a vaccination booster would be necessary for broader protection. Dr. Carlos Salgado Castillo, from Johns Hopkins University, answers questions from Guillermo Arduino and followers of Encuentro Digital CNN.