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Without going to the extremes that you go to, this whole thing smells bad to me. Nor do I have the knowledge that you seem to have.
But there are several things that are suspicious: the detected cases of flu have dropped drastically this year. Some people say it's because of hygiene measures, such as washing your hands and wearing masks but why are the cases of coronavirus still on the rise? The symptoms are similar.
It smells bad.
On the other hand: I know of several cases of people living with people with coronavirus and they don't catch it. They continue to be negative after several tests, but isn't it so contagious that we have to wear masks?
And finally: how quickly the vaccines will be marketed, which will give juicy profits to the pharmaceutical companies and the exemption of responsibility to the latter if there are harmful effects in the long term.
The easy beginning of the answers to some of your questions, is to ask the real question that the thread title should ask. "Is there any proof that Covid is Covid?" Think about it.