The general problem in Bulgaria is that if you're sick, you don't stay at home. Sick children can't stay at home alone and most parents can't take time off from work, because their employer won't let them to or will give them hard time about it. And it's just the same if you're an adult. Moreover, you'll have to wait a month or two before you receive your money for the sick leave... and a lot of people can't afford that.

So no matter how high your temperature is and how much you are coughing and sneezing, you just go out and spread the virus.

And the idea of the flu vacation is that students will stay at home and stay healthy, but of course that rarely happens. :)