Could zombies ever be real?

I'm not talking about zombies as in being rose from the dead. I'm on about a virus outbreak that messes with the brain and can be transmitted by bites and saliva. Increased aggression, loss of intelligence, and so on. Literally like a virus like in 28 days/weeks later. What if a human created a virus like... show more I'm not talking about zombies as in being rose from the dead. I'm on about a virus outbreak that messes with the brain and can be transmitted by bites and saliva. Increased aggression, loss of intelligence, and so on. Literally like a virus like in 28 days/weeks later. What if a human created a virus like this? Could it happen?
Literally making people going psycho, like a super mad cow disease. Thanks :D
Update: It could happen via:

Brain parasites
Human/natural virus
ETC
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