The following is a list of symptoms in the Necroa Virus DLC:
| Symptom | Description | Base Cost | Infectivity | Severity | Lethality | Change to cure requirement | Zombie traits increase |
| Insomnia | Inability to sleep makes people irritable and less productive | 5 | 1 | 2 | 0 | 0.01 (0.01 Change to Research Efficiency | |
| Fever | Increase in temperature, contagiousness and severe dehydration, which can be fatal | 5 | 2 | 2 | 0 | 0.01 (0.01 Change to Research Efficiency | |
| Photophobia | Sensitivity and pain when eyes exposed to sunlight. Slows future research speed but slightly reduces infection rates | 1 | -2 | 2 | 0 | 0.01 (0.02 Change to Research Efficiency | |
| Delirium | Reduction in cognitive function causes irrationality and paranoia. Can be fatal and significantly slows future research speed | 12 | 1 | 3 | 1 | 0.1 (0.03 Change to Research Efficiency | |
| Coma | Neuropathic effects in the brain stem cause loss of consciousness and sometimes death. Significantly slows future research speed but reduces infection rates | 8 | -5 | 4 | 0 | 0.1 (0.07 Change to Research Efficiency | |
| Psychosis | Psychotic episodes lead to occasional bursts of extreme violence which can be lethal. Increases infectivity and slows future research speed | 13 | 6 | 3 | 1.5 | 0.05 (0.01 Change to Research Efficiency | |
| Acute Encephalitis | Multiple inflammatory lesions in the brain triggered. Causes neurological damage resulting in death | 21 | 1 | 1 | 13 | 0 | |
| Hyper Salivation | Inflammation of the submandibular gland increases saliva production and infection rates | 7 | 3 | 2 | 0 | 0.01 | |
| Polyphagia | Compulsive hunger forces continuous eating. Lack of hygiene increases risk of infection | 7 | 4 | 2 | 0 | 0.01 | |
| Gastroenteritis | Inflammation of the GI tract causes frequent vomiting. Significantly increases infection rates | 8 | 6 | 2 | 0 | 0.01 | |
| Cannibalism | Extreme compulsion to bite or eat other humans significantly increasing infectivity as well as lethality | 20 | 8 | 6 | 1.8 | 0.05 | |
| Autophagia | Compulsion to bite or partially devour own body - typically fingers or skin. Increases infection rates | 8 | 7 | 2 | 0 | 0.01 | |
| Cytopathic Reanimation | Formation of complex neural structures enables re-animation of damaged cells and restoration of lower level vitals. Turns dead into zombies | 11 | 0 | 3 | 1 | 0.1 Change to Research Efficiency | Zombies active turned on |
| Anaerobic Resuscitation | Infected brain cells switch to anaerobic respiration. Lactic acid buildup is lethal and destroys higher brain processes and personality | 9 | 0 | 2 | 7 | 0.1 Change to Research Efficiency | |
| Enhanced Sensory Integration | Nutrient flow to the occipital and temporal lobes increased. Enhanced sight and hearing increases severity | 5 | 0 | 4 | 0 | 0 | |
| Temporal Lobe Manipulation | Zombies attracted to movement and will abandon victims once dead. Prey more likely to remain intact and become a zombie | 11 | 0 | 1 | 0 | 0 | Change to Zombie Conversion +0.1 |
| Cathemeral Shift | Stimulation of primary visual cortex improves vision in bright sunlight. Significantly increases severity | 8 | 0 | 8 | 0 | 0 | |
| Vampiric Hunger | Zombie prefers to suck the blood from its prey rather than eat its flesh. Prey more likely to remain intact and become a zombie | 15 | 0 | 1 | 0 | 0 | Change to Zombie Conversion +0.1 |
| Hyperosmia | Thinning of the nasal epithelium significantly heightens zombie sense of smell. Increases severity. | 8 | 0 | 7 | 0 | 0 | |
| Adrenal Surge | Mutation of the adrenal cortex causes adrenaline over-production, increasing alertness and aggression of zombies | 9 | 0 | 8 | 0 | 0 | |
| Lumbrical Hypertrophy | Significantly strengthens zombie grip making it nearly impossible for prey to break free. Severity significantly increased. | 10 | 0 | 9 | 0 | 0 | |
| Enhanced Motor Control | Nutrient flow to the parietal lobe increased, improving movement and coordination. Increases severity, particularly in urban environments | 3 | 0 | 3 | 0 | 0 | |
| Masticatory Tension | Masticatory muscles become engorged, allowing zombies to bite through thick clothing. Severity increased | 9 | 0 | 8 | 0 | 0 | |
| Anabolic Boost | Surges of testosterone significantly increase muscle mass and weight of some zombies. Severity significantly increased | 18 | 0 | 15 | 0 | 0 | |
| Peptide Surge | Growth hormone production triggers extreme metabolism of fat to build muscle. Enhanced strength increases severity | 6 | 0 | 6 | 0 | 0 | |
| Acidic Reflux | Extreme laryngopharyngeal reflux causes acidic saliva. Increases severity and gives zombies a combat advantage | 9 | 0 | 4 | 0 | 0 | |
| Naja Mortis | Muscle growth around submandibular duct lets some zombies projectile spit at prey. Increases severity and zombie combat advantage | 16 | 0 | 8 | 0 | 0 | |
| Autothysis | Explosive mix of hydrogen sulphide and methane collects inside zombie. Significantly increases severity and zombie combat advantage | 22 | 0 | 10 | 0 | 0 | |
| Dermal Calcification | Mutations in the endocrine system cause parts of the skin to harden and calcify. Gives zombies a combat advantage. | 12 | 0 | 0 | 0 | 0 | |
| Cranial Elephantitis | Adenoma triggers mutated growth hormones which encourage bone growth in skull. Gives zombie combat advantage | 9 | 0 | 0 | 0 | 0 | |
| Bone Dysplasia | Increased bone density provides enhanced protection against trauma. Gives zombies a significant combat advantage | 15 | 0 | 0 | 0 | 0 |
Symptom Map for Necroa Virus