They cover but not for long. The first studies on the efficacy of large-scale vaccines seem to confirm that there will be a need for a short-term booster even for those who have completed the vaccination course. And the United States is gearing up to do so.
A third dose of the vaccine for people over 65 years or with the system immune compromise: this is the increasingly concrete orientation of the health care heads of the administration Biden. The New York Times reports it.
The decision seems to be linked to a fact: vaccines Pfizer e Modern they would be less effective after six months.