I heard that in US if somebody dies and had pre-existing conditions the pre-existing condition is usually the official cause of death. So the person is not coun

I heard that in US if somebody dies and had pre-existing conditions the pre-existing condition is usually the official cause of death. So the person is not count. This has to be even more true with flu. If somebody had lung problems and the flu season makes things worse and she ends up dying, the doctors are not normally going to test for flu. And the cause of death is not going to be "flu". What I am trying to convey is that both numerator and denominator of the death ratio are very noisy since they depend on who and when is tested. I have been trying to understand for a few days how the numbers are really counted for COVID-19. And again, it pretty clear that we do not have the real data for a "normal" flu either. So for now my understanding of how bad COVID-19 is compared to "standard" flu has been largely inconclusive. One thing though started getting clearer. COVID-19 is a virus with no vaccine. I have largely underestimate the importance of immunizations and being in a good health. Now I started to picture more and more that without a way to keep our immune system alert against the viruses, we will be greatly screwed almost every year because the demographic at risk would inondate the health care system in a way that they cannot cope.