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Abstract：
Although vaccination is carried out worldwide, the vaccination rate varies greatly. As of 24 May 2021, in some countries, the proportion of the population fully vaccinated against COVID-19 has exceeded 50%, but in many countries, this proportion is still very low, less than 1%. This article aims to explore the impact of vaccination on the spread of the COVID-19 pandemic. As the herd immunity of almost all countries in the world has not been reached, several countries were selected as sample cases by employing the following criteria: more than 60 vaccine doses per 100 people and a population of more than one million people. In the end, a total of eight countries/regions were selected, including Israel, the UAE, Chile, the United Kingdom, the United States, Hungary, and Qatar. The results find that vaccination has a major impact on reducing infection rates in all countries. However, the infection rate after vaccination showed two trends. One is an inverted U-shaped trend, and the other is an L-shaped trend. For those countries with an inverted U-shaped trend, the infection rate begins to decline when the vaccination rate reaches 1.46-50.91 doses per 100 people.
摘要：
虽然疫苗接种在全球范围内进行，疫苗接种率差异很大。截至2021年5月24日，在一些国家，完全接种COVID-19疫苗的人口比例已超过50%，但在许多国家,这个比例仍然很低，不到1%。本文旨在探讨疫苗接种对COVID-19大流行传播的影响。由于世界上几乎所有国家的羊群豁免权都没有达到,通过采用以下标准选择了几个国家作为样本病例:每100人超过60剂疫苗和超过100万人的人口。最后,总共选择了八个国家/地区，包括以色列,阿联酋,智利,联合王国,美国,匈牙利,卡塔尔。结果发现，疫苗接种对降低所有国家的感染率都有重大影响。然而,接种疫苗后的感染率呈现两种趋势。一个是倒U型趋势,另一种是L型趋势。对于那些呈倒U型趋势的国家，当疫苗接种率达到每100人1.46-50.91剂量时，感染率开始下降。
