A man in a lab coat is looking through a microscope.
A scientist is inspecting a new strain of virus
We have no idea if he is a scientist, he could be anyone, many people use microscopes and wear lab coats. We have no idea if he is looking at a new strain of virus, he could be looking at anything.
Not every man in a lab coat is a scientist. A man can look through a microscope for other reasons besides looking at a new strain of virus.
Just because a man in a lab coat is looking through a microscope, doesn't mean he is a scientist.