Measles is one of the leading causes of childhood deaths worldwide. Not only does measles kill, but it can leave children blind, deaf or developmentally disabled, even while they are still in their mothers' wombs. Yet the disease can be prevented with just two doses of a safe and inexpensive vaccine.
When measles broke out in the U.S. state of North Carolina earlier this year, Pamela McCall was one of the health officials who tracked down the cases.
"It is one of those immunizations required for school entry, so most people, most children, are vaccinated and most people are vaccinated against it," said McCall.
That's why fewer than a dozen people in North Carolina actually got the disease. In the U.S., vaccines have made many diseases rare, or non-existent. Dr. Chesley Richards is with the Centers for Disease Control and Prevention.
“Vaccines have made an enormous impact on improving health in the United States. Diseases like smallpox, measles, polio, they’ve been eliminated or eradicated in the United States and in the case of smallpox, it’s been eradicated worldwide," said Richards.
1.womb n. [解剖] 子宫；发源地
The baby's head was starting to emerge from the womb.
2.track down 跟踪追捕；对…追查到底；(根据留下的线索)查线到；探索到
It was not long before I tracked down the lost watch.
3.immunization n. 免疫
Health workers spread the word about the benefits of immunization.
4.polio n. 小儿麻痹症（等于poliomyelitis）；脊髓灰质炎
The polio vaccine has saved millions of lives.
5.smallpox n. [内科] 天花
Vaccination immunizes people against smallpox.