[Harmless Teddy Bear]

Since medical professional working at their trade have worn masks for decades, there is a reason. The masks protect the patient and the medic

They never wore masks for viruses.

They wear masks to prevent the spread of bacteria.

Which is an entirely different thing.

You might as well say medical professionals have worn scrubs and uniforms for decades and so that will stop viruses.

[Jim Noble]

They never wore masks for viruses

What to doctors and nurses do when they enter a patient's room with varicella (chicken pox), rubeola (measles), or influenza?