More than 40 vaccines are undergoing clinical trials in the US, employing a number of different approaches to protect people from coronavirus.

Here are four things to know about  what vaccines are on the way and how some could be better than what’s available now.

So far, 38 vaccines have been approved around the world, and the US has approved three of those.

There are currently 195 vaccine candidates at different stages of development worldwide, out of which 41 are in clinical trials in US.