In a recent study conducted at the Baylor College of Medicine, Houston, USA, scientists have identified six vaccine breakthrough cases caused by the delta variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).
www.news-medical.net
Six vaccine breakthrough cases identified in the study highlight the notion that antibodies elicited by Pfizer/BioNTech BNT162b2, Moderna mRNA-1273, and Covaxin BBV152 may not be sufficient to provide full protection against the delta variant. Although some people fail to develop adequate immunity in response to vaccination, none of the patients identified in the study had a history of vaccine failure.
As mentioned by the scientists, mutations in three antigenic regions of the spike receptor-binding domain (450–469 IDf, 480–499 IDg, and 522–646 IDh) could potentially reduce the susceptibility of delta variant to antibody-mediated neutralization.