More data is still awaited on the need of booster dose.
Facts:
Georg Behrens of Hanover Medical School emphasized that it must be taken into account at what point Israelis who were infected with the delta variant had been vaccinated. The first vaccinations were given in December 2020, and Behrens said the effect of the initial inoculation could slowly wear off, making another dose necessary.
The manufacturers of the BioNTech-Pfizer vaccine have also pointed in that direction in their latest press release. In order to maintain efficacy, they are calling for approval of a third vaccination dose six months after the second vaccination.