My name is Alex Jay Mercer. Lead scientist of the UN Cancer program.

To whomever who might find this recording, I'm...sorry...I'm so terribly sorry... This wasn't how I imagined things to end.

Everything happened so fast.

Nobody had been prepared. At first it had started off as an innocent yet groundbreaking research. Doctors were working together, on the point of finding a cure for cancer. Any type of cancer.

Even better, they were almost certain that, if their formula worked, it could be used as a vaccine to prevent the sickness from ever happening. Millions were pumped into the research.

The cure was unheard of; Scientists manipulated the HIV virus so it would attack the cancer cells instead of the host's immunity. By altering the virus' fixation on the immune system and redirect it to recognize the fast growing cancerous cells, whoever was injected would enjoy a lifelong security. The idea was ingenious and tested on animals in a meticulous research.

Rats, mice, canines and working our way up to primates. Slowly but surely they had all been tested. Observed. Results carefully written down, calculated and recalibrated, where every faulty test run was instantly destroyed, pulled apart and pushed back on track until we finally found it.

My group of scientists had created HCV, the Human Cancer deficiency Vaccine.

You can't imagine how euphoric we were to find out we had a 100% recovery on each animal injected. No sign of cancerous cells nor any sign of HIV in the blood works. The government pushed the paperwork that was needed and in the course of three months after the results came in, people were getting injected with it.

We should've waited...

We were so focused on trying to cure one sickness; we were ignorant enough to use another. Manipulate it.

By the time that we figured out the virus had mutated, 747.639 people had been injected with HCV in the USA alone. 5.293.465 worldwide.

Sick or healthy, infants, children, adults...

On the 21th of October last year, we discovered that our interests in the newly developed virus weren't just to cure. Military labs had already inducted its own tests with it in order to create a new bioweapon.

Somehow, the two samples got mixed, Patient 0 who had been injected with the vaccine and who had also been a volunteer at the unnamed program to test Weapon X.

Now the Vaccine turned into a new, deadlier version of HIV. Instead of taking down the immunity, which could take months, even years, the virus pulled out a full assault on the nervous system.

How ironic that my whole life, I've been trying to save people, to make a cure that would carry my name, make me famous. And now I'm known as the creator of the Mercer Virus.

From the five million that were vaccinated,2.5 million died in the first six months after the Mercer Virus entered their bloodstream. Mortality rate skyrocketed as the virus caused people to grow mad, attacking on sight.

1.7 billion people were massacred by the sick, brutally murdered and left for dead on the streets, even in the comforts of their homes.

Left to change.

I created a virus that doesn't need a living host. It multiplies in the brain tissue of its host, disrupting their normal behavior until they grow aggressive and mad. It isn't until they die that the virus is able to transfer and infect new, potential hosts while keeping the previous one in a living state.

And now humanity is struggling to survive the outbreak.

I'm terribly sorry. But please, take my advice and words of caution to heart.

Don't make a sound.

Don't run.

And whatever you do...

Do not get Bitten.