Long-term persistence of SARS-CoV-2 neutralizing antibody responses after Covid-19 infection: levels conferring 50% protection are maintained for around 990 days post-symptom onset.
In a paper published on The lancet researchers of University of Hong Kong used 50% plaque reduction neutralization test (PRNT) antibody titre data from 115 sera collected longitudinally from 90 to 386 days after onset of symptoms or first RT-PCR confirmation from 62 RT–PCR confirmed SARS-CoV infected individuals, to estimate that PRNT antibody will remain