There is a better than even chance that if you ask someone at the Centers for Disease Control and Prevention (CDC) or the World Health Organization (WHO) or your family physician who first discovered the poliovirus and when they did it, they would have a hard time coming up with the right answer.
In discussions about the pros and cons of certain vaccines, inevitably the question comes up… “Well, surely you don’t have any problem with the tetanus vaccine?” Usually, the question is followed up with a second question… “I mean, if you stepped on a nail, you’d definitely want to get a tetanus shot, right?”
Because of the recent outbreaks of measles in the United States, we're again starting to hear references to the theory of "herd immunity," the foundation for the mass vaccination campaigns around the world.
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