Well, they do that for a reason - because it's the unvaccinated fueling this surge and putting us back to where we were back in January all over again.
Yes the vaccinated are getting the delta variant more than they were the previous mutations, but it's still overwhelmingly a surge of the unvaccinated. That's for a couple of reasons. First, the vaccinated are just far less likely to get infected in the first place. But even for those that do have a breakthrough infection, the viral loads they see in them are just as high as unvaccinated people early on, but quickly drops (within 5 days) while the viral loads in unvaccinated people persists. The reason for that is, the type of response the COVID vaccine produces in a person means that they have antibodies circulating around in high numbers in the bloodstream. The virus doesn't have long to replicate before those antibodies start attacking it and reducing the load before the person gets very ill or spreads it to a lot of people.
The way this doctor explains it, it's akin to someone trying to break into a house. While the vaccines don't 100% prevent the would-be burglar from getting on the property and opening the door, it's like the homeowner is armed with a bat on the other side of the door and when the guy gets in, starts beating the intruder up. The unvaccinated person is more like a home where no one's at home and the intruder virtually has free rein to ransack and steal.
An expert explains why vaccines — and masks — are so important, and why delta is different and more dangerous.
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Look, our God-given immune systems are amazing and for most stuff they work great all on their own. But God also gave us medical knowledge, scientific advancement, men and women who study for years and dedicate their lives to understanding disease-causing pathogens and how to help our immune systems combat them, and the ability to produce treatments to alleviate symptoms and/or vaccines to help prevent them from doing serious damage to us. We should receive these wonderful advancements with thanksgiving just as freely and willingly as we receive and are thankful for the immune systems we're born with.
As has been said before, I trust God when I'm driving, but I still wear a seatbelt and buy cars with better safety features and crash test ratings. I trust God out on the lake in a boat, but I still have enough life vests for everyone on my boat. I trust God, but still have a security system, smoke detectors and lock my house at night. I trust God, but still take my prescribed medicines. It's a false dichotomy to pit trusting God with your immune system vs trusting in vaccines or other treatments. The things aren't mutually exclusive. Medical science and faith are not opposed to one another.