Countries are starting to offer a fourth dose of the Covid-19 vaccine to vulnerable groups, but healthcare professionals are unsure if it will benefit the wider population, CNBC reports. The U.S. Food and Drug Administration has so far authorized…
Countries are starting to offer a fourth dose of the Covid-19 vaccine to vulnerable groups, but healthcare professionals are unsure if it will benefit the wider population, CNBC reports. The U.S. Food and Drug Administration has so far authorized…