Pfizer/BioNTech's Covid-19 mRNA vaccine provides an added layer of protection against reinfection for people who have been previously infected with Covid-19, as well as increased immune durability over time, according to two studies published Wednesday
The studies offer more insight into the concept of hybrid immunity: when previously infected people, who have"natural immunity," then get vaccine-acquired immunity.One of the studies, conducted out of Israel, found that amongst people who had recovered from Covid-19 infections, reinfections were over four times more common in those who did not receive vaccines than in those who did after the primary infection.
According to Crotty, hybrid immunity allows the body to create more diverse antibodies to neutralize a wider variety of variants. This also happens with full vaccination and a booster, but it happens much faster with infection followed by vaccination."Hybrid immunity has got a whole bunch of additional bonuses to it. One, that these studies are showing quite presently, is durability. Durability is quite robust," Crotty said.
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