The author most likely uses the tone in the passage to reinforce the point that

the US is now free from mad cow disease.
Hughes and his team are very accomplished.
another mad cow disease outbreak is possible.
Hughes dreams of fighting epidemics with his team.

Where did the term “iron curtain” originate? the warsaw pact used the term iron curtain as a code word for communism. in a 1946 speech, british prime minister winston churchill said an iron curtain had fallen across the continent of europe. while visiting western europe in 1946, u.s. president harry truman commented that the mountains there looked like iron curtains. russian general secretary joseph stalin instructed citizens of eastern europe to hang iron curtains over their windows to protect themselves from stray bullets.