So far, we’ve discussed the historical legacy of vaccines as man-made enhancements for our existing immune weaponry. And we’ve taken a look at some of the extensive defenses of the innate immune system that guard us day and night from the billions of natural viruses and bacteria roaming the earth. But like any fortress, there are vulnerabilities to be exploited. One way or another, pathogens can occasionally slip through and start using the body’s resources to replicate and cause major damage. In these cases, the immune system has to switch tactics from defensive to offensive. The first step is raising…
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