When are the humans alerted?

[Bobazoid1]

So, at what point do the humans start working on a cure?
Is it when the disease's severity gets too high or starts getting lethal?

I supposed it also depends on what level difficulty you are playing as well.

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It seems to me that the humans don't get too aggressive (start seeing the blue cure bubbles) until you evolve symptoms that are lethal?
At least on the Bacteria - Brutal level on IOS.
I have not tried this theory on the XB1 version yet.

(09-10-2015 04:36 PM)Bobazoid1 Wrote:  So, at what point do the humans start working on a cure?
Is it when the disease's severity gets too high or starts getting lethal?

I supposed it also depends on what level difficulty you are playing as well.