Scary! But not too far-fetched. For measles, no. But for H51B? Yes. Remember the AIDS scare from the 80's? Apparently there was a blacklist somewhere in the halls of D.C. at the time. The technology now makes it far easier.
"An idealist is one who, on noticing that a rose smells better than a cabbage, concludes that it will also make better soup." - H.L. Mencken