Comparing the differences between COVID-19 vaccines - Mayo
Pfizer - Doses Two doses are needed, 21 days apart (or up to six weeks apart, if needed) in the U.S. Some protection provided after the first dose. The CDC recommends a third dose of an mRNA COVID-19 vaccine (at least 28 days after the second dose) for some people with weakened immune systems, such as those who have had an organ transplant.
DA: 62 PA: 91 MOZ Rank: 55