COVID-19 vaccines were developed in record time due to scientists’ good understanding of similar coronaviruses and unprecedented investments from companies and governments
COVID-19 vaccines were developed in record time. This is due to previous research on coronaviruses, unprecedented investment, and the prevalence of the disease. Vaccines aim to prime the immune system to respond quickly to the disease in the future. Several vaccines have been developed in this way, saving millions of lives. However, this is not always straightforward to achieve depending on how the immune system responds and the variety of antigens it would need to recognize.