Dr. Tom Frieden, former CDC director under President Obama, says he is encouraged by the data from Pfizer’s vaccine trials that showed it would be 90 percent effective. But he also warned it’s too soon to tell if it will work for everyone. He…
Dr. Tom Frieden, former CDC director under President Obama, says he is encouraged by the data from Pfizer’s vaccine trials that showed it would be 90 percent effective. But he also warned it’s too soon to tell if it will work for everyone. He…