Ways to create a zombie

5 scientific reasons zombie apocalypse could actually happen
I thought this was really interesting and also kinda funny.

So here is some of my ideas on realistic zombies:

Zombie Outline

Causes:

• Virus: Require a living host. They change the cells and copy themselves throughout the body.

• Rabies- infects the central nervous system & travels to the brain, where symptoms start.

• Symptoms:

• Fever, headache, weakness

• Insommnia, anxiety, contrusion, partial paralysis, excitation, hallucinations, agitation, hyper salivation, difficulty swallowing, hydrophobia

• Mania, coma

• Incubation period:

• several months to travel the nervous system

• Several days once in the brain

• Mad Cow Disease- infects the nervous system

• Symptoms:

• Depression, loss of coordination, anxiety, paranoia, OCD, psychosis

• Dementia, memory loss, personality changes, hallucinations

• Incubation period:

• Typically fatal within 13 months

• Movie references:

• 28 Days Later/ 28 Weeks Later- "rage" virus, change in 30sec., bitten by chimp

• The Crazies- "Trixie" virus, change in 8hrs, in drinking water

• I am Legend- Measles lik virus, opened the adrenal gland and caused high metabolisms

• Resident Evil- "T-Virus", mutagenic virus, causes need to feed to replenish the energy produced by the virus, destroys higher brain functions, damages the hypothalamus, and causes rage

• World War Z

•  Parasite

• Fungus spores affect the brains of ants causing them to climb up onto a plant and latch onto the underneath side of a leaf or stem. The fungus consumes the insides of the ant and produces a plant which grows from the head of the ant. Once fully grown the plant releases spores which continues the cycle. This can also affect other insects as well.

• Toxoplasmosa Gondii– infect rats causing their instinct for self-preservation to switch off. Often times the rats are compelled to get eaten by cats so the parasite can reside in the cat

• Neurogenesis- the use of stem cells to re-generate brain tissue. Scientists are already able to regrow brain tissue in labs. If they can reanimate brain stem tissue in a brain dead patient technically they would have a zombie. (chickens living without a head for extended periods of time)Nanobots- machines or robots whose components are at or close to the scale of a nanometer (10−9 meters.
• Nanobots- machines or robots whose components are at or close to the scale of a nanometer (10−9 meters.
• Uses:
• Drug Delivery System
•   Researchers at Harvard and MIT have been able to attach special RNA strands to nano-particles, filling them with a chemotherapy drug. These RNA strands are then attracted to cancer cells. When the nanoparticle encounters a cancer cell, it sticks to it and releases the drug into the cancer cell. This drug delivery method has greatly influenced the cancer treating community by avoiding the negative effects of chemotherapy. 
•  Find and destroy diseased cells such as cancer or toxic chemicals in the environment
•  Detection of toxic chemicals, and the measurement of their concentrations in the environment
•  Future medical nanotechnology is expected to employ nano-robots injected into the patient to perform work at a cellular level.
•  Tissue Repair (Re-Animation)
•  Another useful application of nano-robots is assisting in the repair of tissue cells alongside white blood cells. The recruitment of white blood cells to the affected area is the first response of tissues to injury. Because of their small size nano-robots could attach themselves to the surface of recruited white cells, to squeeze their way out through the walls of blood vessels and arrive at the injury site, where they can assist in the tissue repair process. Certain substances could possibly be utilized to accelerate the recovery.