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@dredmorbius @isagalaev @kravietz The presence of anti-spike or anti-nucleocapsid IgG antibodies was associated with a substantially reduced risk of SARS-CoV-2 reinfection in the ensuing 6 months.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7781098/?report=reader
@dredmorbius @isagalaev @kravietz Israelis who had an infection were more protected against the Delta coronavirus variant than those who had an already highly effective COVID-19 vaccine
https://www.science.org/content/article/having-sars-cov-2-once-confers-much-greater-immunity-vaccine-vaccination-remains-vital