With Pfizer vaccine 85 percent effective is a second dose needed?
Dr. Cynthia Morrow/VDH-VT photo A new study reported on today says the first dose of the Pfizer vaccine is 85 percent effective in preventing COVID-19 infection -- so is the second…
Dr. Cynthia Morrow/VDH-VT photo A new study reported on today says the first dose of the Pfizer vaccine is 85 percent effective in preventing COVID-19 infection -- so is the second…