The first generation vaccine developed by BioNTech-Pfizer works against coronavirus variants such as the Delta strain and does not need to be modified for the moment, the chief executive of German company BioNTech has said.

“It is quite possible that in the next six to 12 months, further variants will emerge and that would require adaptation of the vaccine but it is at the moment not yet the case,” AFP quotes Ugur Sahin as telling journalists.

“Making a decision at the moment might turn out to be wrong in three or six months if another variant is dominating. Therefore the timing of the decision must be appropriate,” he said.

“At the moment we have a good understanding that the booster vaccine with the parental strain is completely sufficient,” stressed Sahin.