Plague Inc. Wiki
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Anaemia[Note 1] is a tier 1 symptom. It increases severity and infectivity slightly. With the tier 1 symptom Insomnia, it can make the Walking Dead symptom combo, which unlocks the Brainzzzz achievement.

Notes

  1. US Spelling: Anemia - Plague Inc. is developed by a British game studio, so it uses UK spelling (Wiktionary Entry)
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