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Vaccine efficacy and duration of protection

Why is a second dose of some COVID-19 vaccines needed?

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12/9/2021

Two doses of some COVID-19 vaccines are needed to ensure you are getting maximal protection. The extra protection offered by the second dose is very important in order to generate a strong immune memory, to increase the amount of antibodies but also its avidity and neutralization capacity. The second dose will not only reduce your chance of becoming very sick but also extend this protection for a longer period.

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