Post-vaccination antibodies against SARS-CoV-2: Correspondence

Area of Science:

• Immunology
• Vaccinology
• Epidemiology

Background:

• The study examines antibody responses to the Pfizer-BioNTech vaccine in healthcare workers.
• It notes a decrease in specific antibodies (IgG-S and IgG-NP) after the second vaccine dose in individuals with recent SARS-CoV-2 infections.

Discussion:

• The authors agree that prior COVID-19 infection can enhance immune resistance.
• They emphasize the critical importance of accounting for potential confounding effects of previous asymptomatic SARS-CoV-2 infections when evaluating vaccine efficacy.

Key Insights:

• Antibody levels may decrease post-vaccination, particularly in those with recent infections.
• Asymptomatic SARS-CoV-2 infections are common and can influence antibody measurements.

Outlook:

• Further research is recommended to establish vaccine protection thresholds.
• Booster vaccinations and continued preventative measures are advocated.