Some people do not take the covid-19 vaccine because most question the safety and efficacy of the vaccine. Therefore it is important to create a simple formula to calculate the efficacy of a covid-19 vaccine. The purpose of creating this calculation formula is to allow the public to calculate the efficiency of the covid - 19 vaccine by themselves so that they can understand the effectiveness of the vaccine and decide to take the vaccine. This helps to get a high response to COVID vaccination. 2n
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