The zombie virus started in Russia. When scientists found out they could kill and reanimate flesh.
They infected themselves with the virus. there was only one problem. They had a weird desire for flesh. And we all know what happens when a zombie bites a human. Do you? Well if you don't the person who gets bit turns into a zombie! so almost every one in Russia died or turned in to a zombie. it spread almost everywhere but the u.s.a. nuked it before it could spread. But little outbreaks could happen.
thats the zombie origin