Ever get a slight cold? You caught a low dose of a virus that your body was able to produce ant-bodies and defeat without your symptoms getting worse. It takes a sufficient dose to cause a problem. If you received a small dose, i.e., a small amount of COVID-19 and you recovered without getting medical treatment you have some immunity. Get the vaccine but you already had some partial immunity from your episode with the slight infection. It’s the poison and the dose.
From the interenet: “The dose makes the poison” (Latin: dosis sola facit venenum ‘only the dose makes the poison’) is an adage intended to indicate a basic principle of toxicology. It is credited to Paracelsus who expressed the classic toxicology maxim “All things are poison, and nothing is without poison; the dosage alone makes it so a thing is not a poison.” This is often condensed to: “The dose makes the poison” or in Latin, “Sola dosis facit venenum”. It means that a substance can produce the harmful effect associated with its toxic properties only if it reaches a susceptible biological system within the body in a high enough concentration (i.e., dose). It’s different than getting a little bit pregnant. Some things are either or. Other things are in the maybe, maybe not area.
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