Overview
Here is a list of all the symptom combos. These combos can unlock achievments, and also make your diseases more potent!Disclosure: This information was taken off the Wiki. I put it into an easy-to-read guide for your convenience. Enjoy!
Standard Combos
Projectile Vomiting (Increases infectivity)- Vomiting + Coughing
Walking Dead (Decreases cure reasearch rate)- Insmnia + Anaemia
Profuse Bleeding (Increases lethality and infectivity)- Haemophilia + Skin Lesions
Oops (Lowers productivity, draws attention to the plague)- Diarrhoea + Sneezing
Public Defacation (Increases infectivity, draws attention the plague)- Insanity + Diarrhoea
Swine Flu- (Increase in work needed for cure)- Coughing + Diarrhoea + Insomnia + Nausea + Pneumonia + Vomiting + Livestock 1 and 2
Necroa Virus
Vampire Bat (Increases severity, infectivity, and lethality)- Vampiric Hunger + Bat 1 and 2
Blood in the Air (Increases severity)- Cathemeral Shift + Delirium + Hyperosmia
Tank (Increases severity)- Anabolic Boost + Bone Dysplasia
Spitter (Increases severity)- Naja Mortis + Enhanced Sensory Integration
Boomer (Increases severity)- Autothysis + Liquefactive Necrosis
Cranial Dispersion (Increases severity)- Cranial Elephantitis + Air 3
Walking Contradition (Decreses severity)- Photophobia + Cathemeral Shift
Runner (Increases severity)- Enhanced Motor Control + Engorged Quadriceps
Bath Time (Increases infectivity)- Autophagie + Cannibalism + Polyphagia
Simian Flu
Assassin (Increases ape combat abilities)- Ape Rampage + Primal Awareness
Blind Genius (Increases cure production)- Blindness + Neuro-Enhancement 3
Discovery Channel (Increases ape to ape transmission)- Primal Hunt + Social Cohesion
Fly Magnet (Increases cross-species transmission)- Hominidae Bridge + Diarrhoea
Red Ape Redemption (Increases ape combat abilities)- Horseback Riding + Weapon Creation
Rude Awakening (Increases ape to ape transmission)- Scouts + Excrement
Zombie Panic (Slows research speed)- Subconjunctival Haemorrage + Total Brain Death + Bat 2 + Blood 2
Neurax Worm (Santa’s Little Helper)
On The Naughty List (Decreases happiness)- Gluttony + Intoxication + Sloth
Ultimate Christmas (Increases happiness and infectivity)- Digital Elf + Red-Nosed Guide + Red Suited Pilot