新冠疫苗：有效性、可及性和成本

该文章讨论了新冠疫苗的有效性、可及性和成本。文章咨询了专家，探讨了接种疫苗的最佳时机以及疫苗保护的持续时间。文章重点强调了接种疫苗的重要性，以及疫苗在应对新冠疫情中发挥的关键作用。

## Original Title: New Covid Vaccines: What to Know about Efficacy, Access and Cost
## Article Content:
We asked experts about the right time to get a shot, and how long protection will last.

Original article: https://www.nytimes.com/2024/08/22/well/covid-vaccines-boosters.html