Pfizer began administering its first COVID-19 booster shots Monday.
The trial is looking at safety when the vaccines are co-administered, and will follow up six months later.
Some will receive both shots, others just one shot and a placebo.
The pharmaceutical company is studying a third dose of the vaccine and a pneumococcal vaccine candidate.
The trial is looking at safety when the vaccines are co-administered, and will follow up six months later.
Pneumococcal vaccines help prevent illnesses like pneumonia.
Six hundred adults over the age of 65 are in the trial.
Some will receive both shots, others just one shot and a placebo.
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