Transmissions

Transmission traits can be altered in the Transmission screen. Evolving Transmission vectors increases infectivity and gives you bonuses in specific countries. There are 7 Transmission traits to begin with, then more are unlocked for evolution as you evolve traits. Transmission traits are extremely useful in the early game as most do not increase severity and allow your disease to go unnoticed until the entire population of the Earth has been infected.

Tier 1 Transmissions

Tier 1 Transmissions are the transmissions that are available to you right at the start of the game without using any DNA points.

Tier	1	Transmissions
Icon	Name	Effect	Base DNA Cost	Prerequisite
[1]	Bird 1	Birds become susceptible to infection. Avian carriers increase infectivity, land transmission and mutation	12	None
[2]	Rodent 1	Common flea susceptible to infection. Increase infectivity, especially in urban regions and mutation	10	None
[3]	Livestock 1	Livestock susceptible to infection. Increase infectivity, especially in rural regions and mutation	7	None
[4]	Blood 1	Gives organism ability to spread through blood to blood contact. Increases infectivity, especially in poor regions and mutation chance	8	None
[5]	Insect 1	Insects susceptible to infection. Carrier insects increase infectivity, especially in hot climates and chance of mutation	-9	None
[6]	Air 1	Gives pathogen ability to travel on dust particles. Increase infectivity, especially in arid environments and plane transmission	-9	None
[7]	Water 1	Pathogen can survive outside the body in fresh, warm water. Increase infectivity, especially in humid environments and ship transmission	-9	None

Tier 2 Transmissions

Tier 2 Transmissions are the transmissions that are available to you after buying one Transmission in that Transmission type.

Tier	2	Transmissions
Icon	Name	Effect	Base DNA Cost	Prerequisite
[8]	Bird 2	Avian brain tissue compromised causing birds to attack other species. Increases mutation, infectivity and land based transmission.	-18	Bird 1
[9]	Rodent 2	Rodents directly susceptible to infection. Increase infectivity, especially in urban regions and mutation.	-16	Rodent 1
[10]	Livestock 2	Wildlife susceptible to infection. Increase infectivity, especially in rural regions and mutation.	-12	Livestock 1
[11]	Blood 2	Infected bodily fluids able to pass through mucous membranes. Increases infectivity, especially in poor regions and mutation chance.	-13	Blood 1
[12]	Insect 2	Increases rate of transfer between insects. Increase infectivity, especially in hot climates and chance of mutation.	-20	Insect 1
[13]	Air 2	Gives organism ability to survive suspended in air for a long time. Increase infectivity, especially in arid environments and plane transmission.	-14	Air 1
[14]	Water 2	Pathogen able to survive in chemically treated water. Increase infectivity, especially in humid environments and ship transmission.	-15	Water 1

Tier 3 Transmissions

Tier 3 Transmissions are the transmissions that are available to you after buying two transmissions that have the same infection type.

Tier	3	Transmissions
Icon	Name	Effect	Base DNA Cost	Prerequisite
[15]	Extreme Zoonosis	Infection crosses multiple species barriers. Increases infectivity, especially in rural and urban areas, mutation chance and cross-country transmission.	-22	Bird 2, Livestock 2, and Rodent 2
[16]	Extreme Hematophagy	Pathogen uses host lymphocytes to replicate. Increase in infectivity, especially in poor regions and mutation chance.	-24	Insect 2, Blood 2
[17]	Extreme Bioaerosol	Pathogen bypasses air/water filters due to adaptive cellular shell. Increase infectivity, especially in humid & arid climates and plane/ship transmission.	-16	Air 2, Water 2