We don't know what "permanent damage" is actually happening. I remember having pneumonia in the 90s and it took my lungs over 3 months to recover, and that's from a normal known infection.
I think there is a strong case to be made, that a lot of these "long covid" cases might be a combination of normal pneumonia recovery, nocebo effect and fear/hysteria over this disease.
https://www.nature.com/articles/d41586-020-02598-6
"Evidence from people infected with other coronaviruses suggests that the damage will linger for some. A study published in February recorded long-term lung harm from SARS, which is caused by SARS-CoV-1. Between 2003 and 2018, Peixun Zhang at Peking University People’s Hospital in Beijing and his colleagues tracked the health of 71 people who had been hospitalized with SARS. Even after 15 years, 4.6% still had visible lesions on their lungs, and 38% had reduced diffusion capacity, meaning that their lungs were poor at transferring oxygen into the blood and removing carbon dioxide from it."
We know this much and SARS is poorly studied because it faded away so we generally lost interest in it. This virus is both similar and different enough to be very, very wide spread so even minor negative effects over the total population that gets moderate to mild cases will have the potential to have very large impacts on worldwide health.
As time goes on we are going to better document the consequences of mild and moderate cases and understand these things better, caution seems advisable until we do.
We didn't really shut SARS down so much as it seemed to have shut itself down, conventional epidemic control measures were enough to contain it and it was not quite easily transmissible enough to sustain itself in the wider population without being allowed to gain a real foothold undetected first.
That last point would be why you would not expect (and I would think it is impossible) to find that at the end of the day COVID-19 will be anywhere near as deadly as SARS. We have strong evidence that it takes truly extraordinary measures to suppress this new virus at a rate that will in fact eliminate it from a population when compared to SARS. SARS simply didn't spread that widely because if it did that would directly contradict the relative ease of its containment.
Likewise influenza was well known before the 1917 pandemic, or H1N1.. and?
For example, if one happens in your brain, that's a stroke. Which is known to happen with COVID-19 patients[2].
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[1] https://www.hopkinsmedicine.org/health/conditions-and-diseas...)
[2] https://www.thelancet.com/article/S1474-4422(20)30272-6/full...
It seems very likely at this point that COVID is a disease of the blood vessels, which has the potential to do some really nasty damage to your organs. The numbers are hard to estimate but I've seen experts say that they think about 5 times the number of people who die will have enough problems to be considered having a long term disability. With estimates of case fatality being about .5% - 1.5% that would mean about 5% of the people who get it will have enough long term damage to be disabled.
How bad are people expecting the vaccine to be?