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What is the percentage of effectiveness of the COVID-19 vaccine after the first dose?

The effectiveness of the Covid-19 vaccine after the first dose varies for different vaccines. Generally, the effectiveness is lower after the first dose compared to after the second dose. However, the exact percentage of effectiveness after the first dose may vary and it is important to complete the full vaccination schedule for optimal protection. Remember, receiving both doses of the vaccine is essential to maximize protection against Covid-19.