Blood in the Air is a symptom combo exclusive to the Necroa Virus DLC which causes zombies with heightened senses of smell to seek fresh blood. Severity increases when this combo is in play. Delirium and Hyperosmia are required. The Jaws achievement is earned for forming this combo.
Symptom Combos | |
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Standard Plagues | Red Rain ▪ Oops ▪ Profuse Bleeding ▪ Projectile Vomiting ▪ Public Defecation ▪ Red Rain ▪ Swine Flu |
Simian Flu | Assassin ▪ Blind Genius ▪ Discovery Channel ▪ Fly Magnet ▪ Red Ape Redemption ▪ Rude Awakening ▪ Zombie Panic |
Necroa Virus | Bath Time ▪ Blood in the Air ▪ Boomer ▪ Cranial Dispersion ▪ Runner ▪ Spitter ▪ Tank ▪ Walking Contradiction ▪ Walking Dead |
Shadow Plague | Carpe Jugulum ▪ Vampire Bat |
Cure Mode | Report thy neighbour ▪ Rules are for losers ▪ We're here to help ▪ Happy Frogs ▪ Weapon X ▪ In it together ▪ Humans weren't meant to fly ▪ Shut down everything |
Santa's Little Helper | On The Naughty List ▪ Ultimate Christmas |