What is this, the 1950s, when every scientist was referred to by the media, as a matter of course, as a brilliant scientist?
Don’t capitalize scientist.
Delete the comma after virus.
Virus is singular, not plural; refer to a virus as it, not them. (Yes, I know it’s actually a gazillion of the things, but it’s still a virus, not a collection of different kinds.)
A brilliant scientist has created a horrible virus and placed it in special containers around the world, designed to release their contents on a special date.