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Just a thought I had, but it amazes me that we're still reliant on nature to build vaccines, and even to engineer genes. We understand a great deal about the processes, but can't accomplish the actual building of the vaccines through our own mechanical/chemical processes. If we could, producing vaccines for everything would be extremely cheap, and I'd see no reason why we couldn't be vaccinated against a much larger number of viruses. I wonder if there's some limit of immunization variety where the body is less effective at building immunity to new stuff?
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