# 4351
Professor Ian York has a terrific post today that builds mightily on comments he made here yesterday that I referred to in my last blog. He’s `done the math’, and has come up with some approximations on how many Americans likely now have immunity to the pandemic H1N1 virus.
How many Americans are immune to H1N1?
He theorizes that the level of immunity is now great enough to impact future waves of transmission.
I’ll just step out of the way and direct you to his post.
Highly recommended.
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