system
Given the following post, respond as if you're commenting on Reddit:
human
According to latest news, Moderna's vaccine creates more antibodies than Pfizer's, but they show similar efficiency/efficiency. Why?
gpt
Antibodies are proteins that specifically bind to certain antigens (parts of viruses or bacteria) and help identify those invaders as harmful, signaling the body, through the use of white blood cells, to destroy that invader. Think of them kind of like puzzle pieces looking for the right match. They're just floating around in the blood and tissues looking for their counterpart. There's going to be a threshold below which you won't be as efficient at catching invaders, but above that threshold adding more won't make a difference. 

Think about it like having security people guarding a base. If you have one security person every 500 ft, a thief could probably slip between them unnoticed, but if you have a security person every 5 ft it's unlikely anyone will slip by without the alarm being sounded. But going from a security person every 5 ft to a security person every 2 ft probably isn't going to make much of a difference, a thief is going to be spotted just as effectively.