Disappearance of Antibodies to SARS-Associated Coronavirus after Recovery

Abstract
Previous studies have demonstrated that IgG and neutralizing antibodies against coronavirus associated with the severe acute respiratory syndrome (SARS) may persist, in spite of a decline in titer, for 2 years in patients who have recovered from SARS.1,2 For 3 years, we followed patients who had recovered from infection with SARS-associated coronavirus, to measure the longevity of specific antibodies.