An interesting behavior of our #immunesystem could explain #Vaccine performances against new #covid variants. #Omicron
The immune system will respond to a pathogen in a way shaped by its first exposure to it regardless of how the pathogen may have changed. In effect
When the body first encounters an infection, it produces effective antibodies against its dominant antigens and thus eliminates the condition. However, when the immune system meets the same disease, at a later evolved stage, with a new variant (with a different antigen), the immune system will still produce antibodies against this old “now recessive antigen†and not develop new antibodies against the new dominant one. This results in the production of ineffective antibodies and thus a weak immunity known as Original Antigenic Sin.
Source
Parvathy Sukumaran 
