Why should the use of masks be mandatory? This is how Dr. Elmer Huerta responds | Video | CNN

Dr. Elmer Huerta, a public health expert and professor at George Washington University, reiterates the importance of the use of a mask to contain the spread of covid-19.

"It's like a condom that you have to put on so as not to infect others, and to not infect yourself," explains the CNN contributor by way of analogy.