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Can you elaborate? Cause I also have been confused as to how the vaccine would would but immunity from having had COVID could be insufficient to prevent reinfection.
So for one, the risks of the vaccine are minimal. There is long term safety data on mRNA vaccines showing them to be safe. The trials on this specific one were short term but showed minimal side effects and nothing serious. On the other side, the risks of COVID are extremely serious and range from nothing to death or permanent sequelae. So relying on natural infection is much riskier.
Second, the immunity that you get from natural infection varies from person to person. Depending on how severe your infection is, you may have immunity for 8+ months or only a couple weeks. Everyone gets the same dose of the vaccine. So natural infection doesn’t guarantee lasting or even a decent immunity.