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The greater worry, I believe, is if there is a mutation that kills the healthy, such as the spanish flu pandemic did
Even this is hotly disputed. There is a rival theory that the only reason Spanish flu didn't affect the elderly as badly as the young is that the old were alive for a previous similar flu pandemic that rendered them partially immune.
Still plenty of arguments happening about the hows and whys of Spanish flu.
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And @Chalfie
From what I read, the spanish flu caused the body to over react to the virus
This is the first search hit, https://www.sciencedaily.com/releases/2006/09/060927201707.htm
Interesting point, the issue is that not only the old will be affected as illnesses such as this effect the population that are immunocompromised. So the ones that get the free flu jab and children.
The greater worry, I believe, is if there is a mutation that kills the healthy, such as the spanish flu pandemic did.