if you wait to prepare shelter until the sky starts falling, it is too late.
The flu kills a lot of people every year. But most of the time it is the weaker amongst us (i.e. old and sick). That is because the flu is a minor variation of previous flus.
Occasionally we get a flu that is a whole different beast, that is very different than previous flus, and our bodies really don't have any "memory" in our immune systems to fight it. These can cause pandemics. Our vaccines are useless, and in the case of 1918 pandemic, it was most often healthy young adults who died.
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