They say a picture is worth a thousand words. Here is a perfect example of that.
1. Clear context setting by showing masks.
2. Clear character setting through the uniforms, telling us they are doctors.
3. Strong symbols associated with Super Heroes (look closely) that are formed on the faces due to the long hours of wearing the masks.
4. People of different colour and gender.
As a receiver of the message, you know exactly what they are saying without them using a single word.