How COVID-19 Vaccines Are Being Developed | BOOM

How are COVID-19 vaccines being developed? Several drugmakers have announced that they are moving to Phase 2 of COVID-19 vaccine clinical trials; the Oxford vaccine by Serum Institue of India backed by Adar Poonawala has started Phase 3 clinical trials. What do these phases mean? Should we think that we are close to a getting a vaccine for COVID-19? BOOM Explains.