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My caution is there are too many similarities between Lyme and COVID-19 to assume that a vaccine will work: you cannot create an effective vaccine against something that mutates.
We know very little about COVID-19 so far. However we do know that COVID mutates and spreads rapidly upon activation of the immune system. Therefore, given the nature of how vaccines work, it is illogical to attempt triggering the immune system with a weakened version of COVID.