These days, medical experts worldwide are advancing the research and development of a COVID-19 vaccine at an unprecedented rate. At the current stage of human development, as we all know, a vaccine is unavoidably the key to overcoming Coronavirus. However, while we can produce such a vaccine in a short period, it is only the first step in defeating the pandemic. There are still many challenges. For instance, how to ensure the vaccine’s safety, persuade people that it works, ensure that as many people as possible have access to the vaccine, and, most importantly, the need for multiple shots if we want to achieve effective herd immunity. It’s going to be a long road ahead of us.