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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
Standard Plagues Red RainOopsProfuse BleedingProjectile VomitingPublic DefecationRed RainSwine Flu
Simian Flu AssassinBlind GeniusDiscovery ChannelFly MagnetRed Ape RedemptionRude AwakeningZombie Panic
Necroa Virus Bath TimeBlood in the AirBoomerCranial DispersionRunnerSpitterTankWalking ContradictionWalking Dead
Shadow Plague Carpe JugulumVampire Bat
Cure Mode Report thy neighbourRules are for losersWe're here to helpHappy FrogsWeapon XIn it togetherHumans weren't meant to fly Shut down everything
Santa's Little Helper On The Naughty ListUltimate Christmas
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