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Ultimate Christmas is a symptom combo exclusive to the Santa's Little Helper scenario. When this combo is active, Santa and Rudolph will come out of retirement and pose with children for pictures, making them very happy. It increases infectivity and happiness.

Symptom Combos in Plague Inc. and Plague Inc: Evolved.
AssassinBath TimeBlind GeniusBlood in the AirBoomerCarpe JugulumCranial DispersionDiscovery ChannelFly MagnetOn The Naughty ListOopsProfuse BleedingProjectile VomitingPublic DefecationRed Ape RedemptionRed RainRude AwakeningRunnerSpitterSwine FluTankUltimate ChristmasVampire BatWalking ContradictionWalking DeadZombie Panic
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