Mechanics
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Plague Blossom
The music is exclusive to Plague Inc: Evolved, used for the game's seven main disease types. For the original Plague Inc. game, the main theme is Plague Bloom, which bears a similar title.
Planes
Planes are one of the 2 transportation available in Plague Inc. There are 3 Human-Controlled Planes in the game.
Poor Countries
Poor Countries are quite vulnerable to disease and work slowly on the cure due to their limited amount of funds, and typically only have three or four research facilities. It is very easy to spread diseases there, which is why it is recommended to start one's plague in these countries. However, there may be news about a new programme for new health guidelines, slowing down a plague in these countries without Drug Resistance I. The poorest country is Bolivia, with only two research facilities.
Port
Ports, or Seaports, are a feature in Plague Inc. and Plague Inc: Evolved. They receive ships from other countries.

Purpura
Purple spots and patches form under the skin as blood vessels leak throughout the body. Can be fatal.
Pustules
Highly recognisable raised pustules form - filled with thick opaque fluid which can transmit infection if burst
Respiratory Shift
Gain ability to cause severe pathological conditions in the lungs.
Rich Countries
Rich Countries are wealthy countries. Their wealth gives their population access to better drugs, which slows down the infection rates of the player's plague. This is why it is advised that players NOT start their plagues in such countries. They typically have ten research facilities, making their medical funding contribute greatly to the Cure. However, not all countries with ten research facilities are rich countries. Drug Resistance 1 helps to moderately speed up infection in rich countries, while Drug Resistance 2 virtually negates the fact that the country is rich all together, making it a very useful trait when playing…

Roses
This is the only track not to include any instruments. The song is performed by a child, but the identity of the performer is not known.
Rural Countries
Rural Countries are a type of country where the majority of the population doesn't live in cities, but in the countryside. Infection in Rural countries are slowed due to the remote environment of the country. They are more vulnerable to livestock transmissions than most countries.

Simian Dawn
The music consists of synths and standard instruments (piano, etc.), along with monkey screeches heard on occasions.

South America
South America is a continent in Plague Inc. it has five countries in the game, there are 12 countries in South America in Real life

Spore Burst
Releases a burst of plague spores into the air to infect a new country

Spore Eruption
2 (If Patho-Stasis gene is inserted)

Spore Hardening
Hardens plague spores to survive in the air indefinitely. Spores continuously released.
Urban Countries
Urban countries are a type of country where the majority of the population lives in cities. Infection in Urban Areas spreads faster due to the high population density of the environment. This makes Rodent transmissions more effective in these countries. The following are a list of them:
Vaccine Shield
Pathogen introduces key genetic variations that renders the smallpox vaccine ineffective

Viral Instability 1
DNA becomes unstable, increasing random mutations

Viral Instability 2
DNA occasionally fractures, increasing random mutations

Viral Instability 3
DNA becomes highly erratic and fragmented, increasing random mutations
White Pox 1
Pathogen partially regresses to the milder strain Variola minor. Adopted characteristics reduce severity and lethality
White Pox 2
Pathogen fully regresses to the milder strain Variola minor, significantly reducing severity and lethality

Z Com Falls
Z Com Falls is the 7th track of Plague Inc. Original Soundtrack. Released alongside the rest of the Standard Game and Neurax Worm themes in 2014, it was originally designed to play when playing Necroa Virus in certain versions of the game.