Comparing the differences between COVID-19 vaccines
October 2, 2023
Pfizer Doses
Three doses are needed for unvaccinated children with typical immune systems ages 6 months through 4 years. The second shot is scheduled at least 3 to 8 weeks after the first. The third shot is given at least eight weeks after the second shot.
One dose is needed for people age 5 and older who have a typical immune system.
People age 65 and older and people of any age with weakened immune systems may get additional doses of the vaccine. This helps improve protection against the COVID-19 virus.
Additional doses for people age 65 and older are suggested four months or longer after the last dose.
Three doses are suggested for unvaccinated children ages 6 months through 4 years with weakened immune systems. The second dose is scheduled at least three weeks after the first shot. The third shot is scheduled at least eight weeks after that.
Three doses for unvaccinated people 5 years and older with weakened immune systems. The second dose is scheduled at least three weeks after the first shot. The third shot is scheduled at least four weeks after that.
Additional doses may be recommended two months after the last dose, or as suggested by a healthcare professional.
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Comparing the differences between COVID-19 vaccines