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How effective the vaccines are against variants of the virus that causes COVID-19. Early data show the vaccines may work against some variants but could be less effective against others.
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How well the vaccines protect people with weakened immune systems, including people who take immunosuppressive medications.
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How well COVID-19 vaccines keep people from spreading the disease.
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Early data show that the vaccines may help keep people from spreading COVID-19, but we are learning more as more people get vaccinated.
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How long COVID-19 vaccines can protect people.