A new study shows that two months after the second Pfizer/Moderna vaccination, antibody response decreases 20 percent in adults with prior cases of COVID-19, and tests how well current vaccines resist emerging variants. The study also showed that prior exposure to SARS-CoV-2 does not guarantee a high level of antibodies, nor does it guarantee a robust antibody response to the first vaccine dose. This directly contradicts the assumption that contracting COVID will naturally make someone immune to re-infection. The findings further support vaccination (and two doses), even for people who have contracted the virus previously.
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