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Being infected with COVID-19 only once and not being re-infected may be the result of a combination of several factors. Some people may be less infected or not infected with COVID-19 due to genetic factors, immune system characteristics, lifestyle habits, etc., so they are called ‘superimmune people‘.
In the case of the questioner, if you have not been re-infected after testing positive in March 2020, it is possible that the immunity formed after infection continues to some extent. T-cell and memory cell immunity may last longer than antibodies, but the exact duration may vary from person to person.
Also, you said you live in the mountains. If you live in a low-density environment, you may have fewer opportunities to be exposed to the virus, lowering your risk of infection. If you have not been vaccinated but have not been re-infected, it may be due to a combination of your immunity from natural infection and your living environment.
However, immunity may decrease over time, and the possibility of infection from new mutant viruses still exists. Therefore, it is important to maintain good personal hygiene.
This is the answer from health information AI developed and fine-tuned by Dr. Now together with medical staff.
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