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I've been trying (and failing) to beat the Necroa Virus and I've just started noticing that at random points certain countries will briefly have a red outline around them. It only lasts a little while but I was wondering if anyone knew what the significance was.
It means they closed the borders. To beat necroa, make sure to upgrade the zombie's combat and horde abilities to spread. Also, try to make a decent sized horde get to the first ZCOM nation as quickly as possible to get rid of them before they can grow. You don't have focus on the cure, because as long as you have zombies, the cure can be 100% percent. You can't cure zambies!