It's also worth noting that the most people still had antibodies effective against A.30-- just not as effective. So the existing antibody response would be expected to slow infection and then the body is primed to broaden the variety and quantity of antibodies after infection.
It's only a small portion of those receiving the AZ vaccine whose serum had no significant activity against A.30-- all of those with the mRNA vaccine did and most of those receiving AZ did.
It's only a small portion of those receiving the AZ vaccine whose serum had no significant activity against A.30-- all of those with the mRNA vaccine did and most of those receiving AZ did.