The foreign study seems to be applicable to that particular country. The CDC here in this country studied the same thing and found that people who had Covid are twice as likely to be reinfected with the variant than those who were vaccinated. The severity of the original infection is what governs how long the immunity lasts and apart from checking your blood frequently for antibiotics that is not measurable. Get the vaccine and protect your family. I know someone on a ventilator today that thought he did not need the vaccine.
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