Mechanics
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Environmental Hardening
Pathogen develops hardened coating - becoming highly weather resistant and extremely comfortable in both hot and cold climates.
Evolution
The music is exclusive to Plague Inc: Evolved as the game's main menu theme. For the original Plague Inc., the main menu music is Initiation.
Extreme Bioaerosol
16, 25, (Nipah Virus) 15 (Shadow Plague)
Extreme Zoonosis
Infection crosses multiple species barriers. Increase infectivity, especially in rurals and urban countries, mutation chance and cross-country transmission.
Flatten The Curve
Flatten The Curve is the 11th track of Plague Inc. Original Soundtrack.
Gene Compression 2
Reduce the likelihood of lethal genes becoming unlocked overtime
Gene Compression 3
Reduce the likelihood of lethal genes becoming unlocked overtime
Heat Resistance 1
11 (7 in the Necroa Virus), 8(Neurax Worm)
Heat Resistance 2
22 (17 in the Necroa Virus or Neurax Worm)
Heat Resistance 3
Pathogen avoids cellular breakdown in high temperatures. Increased effectiveness in hot climates
Hendra Traits
Pathogen develops traits of the equine Hendra virus, increasing selection of host animals
Hot climate
Hot climate is a type of climate. Countries with this climate are quite hot. Heat Resistance 1 and 2, Environmental Hardening, and Insect 1 and 2 helps your plague withstand the heat and spread in these countries. Also, if you start a plague in a hot country, it will be better suited for other hot countries than if it had started in a cold or balanced country. One famous hot climate country is Saudi Arabia.
Humid climate
Humid climate is a type of climate. Countries with this type of climate tend to be rather wet, enhancing the effects of Water 1. The Hydrophile gene also increases the disease's effectiveness in countries with humid climate. Two examples of a humid climate are the UK and India.
Initiation
The track is only used in the mobile game, Plague Inc., as its title menu.
Island Countries
Island countries are a type of country which have no bordering nations, and are in the ocean. As they are islands, they can usually only be infected via their seaports. Arguably more so than the cure itself, island countries provide a great challenge, since chances are small that ships will come to the ports of these countries. However, using the Neurax Worm's Trojan planes ability makes it easier to infect these countries.
Land border
A Land Border, or just a border, is a feature in all plague types and versions of Plague Inc. and Plague Inc. Evolved which allow for countries to be infected via land transmission.
Middle Class Countries
These Countries are neither rich or poor, they have a strong middle class on the economy.
Mummification
A severely decayed zombie is able to enter a state of hibernation. Reduces rate of zombie decay, especially in hot countries
Nipah Virus (Ability)
A new strain of the Nipah Virus that spreads harmlessly through bats, with the potential to spread to humans
Nox Eternis
The track is ominous, consisting of vampire growls, a church organ, choir, etc.
Nucleic Acid Neutralisation 1
Reset lethal potential of weapon. Will take time to regenerate
Nucleic Acid Neutralisation 2
Reset lethal potential of weapon. Will take time to regenerate
Nucleic Acid Neutralisation 3
Reset lethal potential of weapon. Will take time to regenerate
Plague Bloom
The track is exclusive to the original Plague Inc. game, used for the main seven diseases. For Plague Inc: Evolved, the main theme is Plague Blossom, which bears a similar title.