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the body does cure itself in most cases (fortunately) but tests are showing that quite a high percentage of those that have recovered do not have many antibodies in their system.
This increases the possibility of them catching it again, it also means that a vaccine (if we ever find one) may not work very well.
Some Virus' are quite difficult to whack because they change so often eg: the annual flu shot is not a real success because flu mutates so often.
A couple of years ago the success rate was 10%, no better than a placebo really. It seems to average about a 36-40% success rate for a virus that we a know a lot about.
Of course, the common cold is a virus and we still haven't whacked that one which is why I do my thing with Vit D, 15 years since I have had a cold/flu now.
I wonder why the young have been so unaffected by Covid-19.
With the older it seems that the best solution lies in the prevention (as is most often the case). If we learnt anything from all this, to combat colds and flu's, it is to keep washing our hands, stay home if you are crook (and STOP the snide and belittling of those who do), manage and isolate (as best we can) those who are sick. AND we no longer say "its just a cold".
If we can manage out Covid-19 with these practices then imagine what we could do with the old common cold and flu.