The immune responses of specific antibodies were maintained in more than 90% of recovered SARS-CoV patients for 2 years, raising the likelihood that the similarly behaving SARS-CoV-2 might provoke the same response, according to an online communication published in the Journal of Microbiology, Immunology and Infection.
Courtesy NIAID-RML
The authors cited a cohort study of convalescent SARS-CoV patients (56 cases, from the Beijing hospital of the Armed Forces Police, China) that showed that specific IgG antibodies and neutralizing antibodies were highly correlated, peaking at month 4 after the onset of disease and decreasing gradually thereafter.
This and other studies suggest that the immune responses of specific antibodies were maintained in more than 90% of recovered SARS-CoV patients for 2 years, according to the authors.
However, of particular concern is the fact that only 11.8% of patients acquire specific SARS-CoV Abs in the early period after recovery at day 7, not reaching 100% until day 90, which highlights the importance of the detection of antibody titers for convalescent COVID-19 patients, according to the authors. “Otherwise, these patients with low titers of antibodies may not be efficient for the clearance of SARS-CoV-2.”
The authors also cited a recent study that showed how neutralizing antibody from a convalescent SARS patient could block the SARS-CoV-2 from entering into target cells in vitro, and suggested that previous experimental SARS-CoV vaccines and neutralizing antibodies could provide novel preventive and therapeutic options for COVID-19.
“These experiences from SARS-CoV are expected to have some implications for the treatment, management and surveillance of SARS-CoV-2 patients,” the authors concluded.
SOURCE: Lin Q et al. J Microbiol Immunol Infect. 2020 Mar 25. https://doi.org/10.1016/j.jmii.2020.03.015.