CNN’s Erica Hill reports on confusion around the amount of second doses of the coronavirus vaccine from Pfizer as the CDC warns the new Covid-19 variants could accelerate the spread of Covid-19 in the US.
CNN’s Erica Hill reports on confusion around the amount of second doses of the coronavirus vaccine from Pfizer as the CDC warns the new Covid-19 variants could accelerate the spread of Covid-19 in the US.
Johnson & Johnson announced Friday that its single-dose vaccine was 66% effective globally in preventing COVID-19, and 72%..
A new, highly transmissible variant of the coronavirus first discovered in Britain could become the dominant variant in the United..