I suppose that if you aren’t vaccinated, your body has never had a chance to ‘see’ the bacteria/virus and make antibodies to defend you. So if you are exposed to the measles virus for example without being vaccinated, there is a chance that your body might be able to fight it off without you getting sick, but it is also possible that your body won’t be able to make antibodies in time and you will end up getting the disease.
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