Easy on all 3 counts:

1. Create an event that fires every day unlimited times (event delay 0, maximum number -1). Under global conditions, put "Trait evolved -> (your trait)", and if you want, a random chance.
Under country conditions, put "Country Effects -> Wealthy = True" and "Infected Population = 0". Under effects, put "Additional Infected Population += 1".

2. Just make the event set "Country Effects -> Country Bonus Infectivity" -= (a number). If you want it to be possible to "take over" and undo this by creating enough chaos in the country (like with Z-Com), you can make this event set a custom country variable to 1, and then run a second event if the custom country variable = 1 and for example, Country Awareness > 80 or Country Order < 0 and make this event add the Country Bonus Infectivity back.

3. Make an effect that fires every day unlimited times, and make it fire only if the traits are not evolved, for country parameters if the custom country variable = 1. In effects, set "Additional Infected Population -= (the amount you want cured per day)".

For events that fire every day, make sure to disable the "reset event counter" checkbox, otherwise they will mess up other events.

引用自 indigofenix：

Easy on all 3 counts:

1. Create an event that fires every day unlimited times (event delay 0, maximum number -1). Under global conditions, put "Trait evolved -> (your trait)", and if you want, a random chance.
Under country conditions, put "Country Effects -> Wealthy = True" and "Infected Population = 0". Under effects, put "Additional Infected Population += 1".

2. Just make the event set "Country Effects -> Country Bonus Infectivity" -= (a number). If you want it to be possible to "take over" and undo this by creating enough chaos in the country (like with Z-Com), you can make this event set a custom country variable to 1, and then run a second event if the custom country variable = 1 and for example, Country Awareness > 80 or Country Order < 0 and make this event add the Country Bonus Infectivity back.

3. Make an effect that fires every day unlimited times, and make it fire only if the traits are not evolved, for country parameters if the custom country variable = 1. In effects, set "Additional Infected Population -= (the amount you want cured per day)".

For events that fire every day, make sure to disable the "reset event counter" checkbox, otherwise they will mess up other events.

Thanks a lot, man. I still need to figure out how the event system works to do advanced effects like this.

I'm having some trouble trying Indigofenix's solution to #1. I can't seem to find any "country effects" tab. There's a "Country Data" tab, but there's no "Wealthy" selection under that tab. Additionally, I can't seem to find a "True" variable to put on the right side of the formula.

Also, I'm unable to put "Infected population += 1" because I can't put "infected population" on the left side of the outcomes formula. I can select it on the right side, but I also can't put any numbers on the left side, so I'm stuck again.

I can work around not having a "Wealthy" variable by using a series of else if statements to put in every wealthy country, but the outcomes formula not allowing me to select the "infected population" leaves me stuck.

Sorry, I wasn't looking at the creator so I put in the wrong variable names.

The actual variable name is "Wealthy Country Effectiveness" under "Country Data". Not to be confused with "Wealthy Country Effectiveness" under "Disease Effects", which is what you'd expect. I don't know why they named it this way.

And the variable to change the infected population is actually "Additional Infections" under "Population". Setting this to negative does cure people.

And the variable to change the country infectivity is actually "Country Infectivity Adjustment" under "Disease Stats".

Ah, I see. So to be clear, there are two "wealthy country effectiveness" variables that do two different things? Can you please explain what each one does?

"Wealthy Country Effectiveness" under "Disease Effects": A numeric value, your disease's effectiveness in wealthy countries (the stat that rises with drug resistance).
"Wealthy Country Effectiveness" under "Country Data": A boolean value, whether the country is wealthy or not.

Same goes for all "environmental" variables (hot, cold, etc.)

Either I just have a weird bug, or this does'nt work with the newest version of SC: I was in the event lab, I made a outcome, I chose set variable, then I clicked the upper "Choose an option" button, but I did'nt see the population thing there.