A vaccine to prevent coronavirus disease 2019 is perhaps the best hope for ending the pandemic. Currently, there is no vaccine to prevent infection with the Covid-19 virus, but researchers are racing to create one.

Coronaviruses are a family of viruses that cause illnesses such as the common cold, severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS). Covid-19 is caused by a virus that's closely related to the one that causes SARS. For this reason, scientists named the new virus SARS-CoV-2.

While vaccine development can take years, researchers aren't starting from scratch to develop a COVID-19 vaccine. Past research on SARS and MERS vaccines has identified potential approaches.