The world impatiently awaits a COVID-19 vaccine, as the pandemic continues to infect millions globally. Health experts caution we probably won't have one until 2021. Why not? VOA Explains the process.
The world impatiently awaits a COVID-19 vaccine, as the pandemic continues to infect millions globally. Health experts caution we probably won't have one until 2021. Why not? VOA Explains the process.
