More likely after first—they already have memory B and T cells to respond to the spike proteins they make. This generates a stronger immune response.
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Look at antibody levels the first time you are exposed to something vs. any subsequent exposure. For those who haven’t had COVID-19, shot 1 is primary, shot 2 is secondary. If you’ve had Covid-19, you experienced primary when you were sick. Shot 1 is secondary. Shot 2 will presumably increase antibody titer even further and give you the power of invisibility. No more signing up for RotR BGs.