Vomiting is a tier 2 symptom. It makes one throw up infected material, increasing the risk of infection.
When combined with the Coughing symptom, the Projectile Vomiting symptom combo is created, which further increases infectivity in a comparatively stealthy fashion, making it easier to infect large numbers in Brutal and Mega-Brutal difficulties without detection. Sneezing is also a good choice.
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