Individual SARS-CoV-2 neutralising antibody immunity lasts from days to decades. Patients were categorized in 5 groups: negative, rapid waining, slow waining, persistent and delayed response.
Study shows that antibody longevity varies widely from 40 days to as long as several decades and not everyone who has recovered from COVID-19 is immune from reinfection Individuals with low levels of neutralising antibodies may still be protected if they have robust T-cell immunity Blood tests and a computer algorithm suggest annual vaccinations might