A new article today brings news about the presence of immunity after COVID-19 infection. The article in the prestigious journal Science shows that protective antibody persists even in patients with non-severe COVID-19. This is an important paper that contradicts many other reports and does so in a convincing manner.
The authors are from Mt. Sinai Hospital in NYC, one of the first epicenters of infection. They examined 30,082 individuals and reported that the vast majority of infected individuals with mild-to-moderate COVID-19 develop robust immunity, demonstrated by IgG antibody responses against the viral spike protein.
The authors also show that the levels of these antibodies in the blood of the individuals are relatively stable for at least a period of five months. The antibody levels to the COVID-19 virus spike protein also significantly correlated with neutralization of real SARS-CoV-2 virus. So not only is the antibody present, but it kills the virus.
Overall, the authors’ data suggest that almost all individuals with COVID-19 develop immunity that persists unchanged for at least five months. This suggests that anyone infected with the virus, even with minimal symptoms, will be protected from reinfection.
Given the quality of this study, it should help refute lesser studies that have argued for a lack of immunity after COVID-19 infections, or immunity that quickly wanes after infection.
This is very good news.