Hydromancerx
C2C Modder
These are not events and all disease events will be replaced by this system.
Sounds great!

I like how your system works. I see this could work well with TB's system on units to where the units could spread it to the cities.
Likewise I had additional ideas.
National Pandemic
If a certain % of your total cities get Outbreaks then you trigger a "National Pandemic" which highly increases unhappiness and revolutions.
Global Pandemic
If a certain % of all total cities get National Pandemics then a "Global Pandemic" is triggered for all. I am not sure what this would do but it should be terrible for everyone.

. This has one slight problem the Druid and Shaman religions allow you build cathedral level buildings which ignore all
and slow the growth of your cities. Outbreaks of disease will increase both in frequency and in severity maybe even killing large numbers of your population.
) 'outbreak' events with each of the various diseases as prereqs might be our solution.
(the disease symbol) to represent the fact that, if not contained, diseases may become worse, then epidemic. This means that when a disease appears, the more you wait to fight it, the harder it will be to eliminate it (along with more severe effects).