Undead Zombies

In 2023 there was a deadly outbreak...

Scientist had discovered a way to keep humans free of
any health issues and had remarkably cured people from
diseases such as Cancer, Aids, Heart Conditions and
Stroke Victims.
Due to it's success, world leaders starting making plans
to mass release it globally, and their fastest and best
option was to inject the serum Z-71 directly into town
water supplies.

2 years later, the serum Z-71 started to have averse
effects, it started infesting into the nervous system of
its host and making chemical changes to their brain.

Soon millions of people all over the world were
effected, and the ones that weren't, they were attacked.
The virus had grown so powerful that anyone who was
attacked and came into contact with any of their bodily
fluids immediately became infected.

Your mission is to find the scientists location and save the world.