Pfizer Begins Testing COVID-19 Booster Shot With Pneumococcal Vaccine.
The drugmaker began administering its first coronavirus booster shots on May 24.
Pfizer is conducting a trial to see if it is safe to administer a third dose of the vaccine... .
... in tandem with a pneumococcal vaccine candidate.
Pneumococcal vaccines help to prevent pneumonia.
600 adults over the age of 65 will participate in the study.
They will follow up with Pfizer six months later