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Originally Posted by lawrenceRaider
If true, then why do we "need" boosters?
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Based on my knowledge of immunology (which is extremely a complex subject and I'm no immunologist) this new Delta variant kind of overwhelms your innate system before Memory B cells can fire up and make enough neutralizing antibodies. So if you don't have a bunch of neutralizing antibodies floating around, you'll get infected. You're adaptive and innate system kick in to knock it down, which would be why most breakthroughs are pretty mild.
It would make sense why viral load for those immunized drops so much and so much quicker than non immune.
Technically, with the amount of time between the two doses, we got two primer doses. We probably should have gone a bit longer to get a booster, but I'm not sure it would matter.