Water 1 is a tier 1 transmission. It increases infectivity, with a bonus in humid environments. It also increases your plague's transmission abilities, allowing it a higher likelihood that it will contaminate ships, thereby infecting new countries.
- Outside of the Fungus, Neurax Worm, Shadow Plague, Simian Flu, and Necroa Virus, this transmission is one of the only ways to infect island countries that only have sea ports, such as the Caribbean and Greenland.
- Sometimes, there can be an event that stops ships from being infected. To counter it, simply evolve Water 1.