To contain outbreaks, surveillance must be vigilant: the virus usually lurks silently,paralysing just one carrier in 200.
为控制疾病爆发,必须在疫情监测上提高警惕:此种病毒通常悄无声息地潜伏于人体内,每200名病毒携带者中仅有1名会遭受此病毒侵袭。
Moreover, the vaccine is delicate and must be kept cool.
此外,由于病毒疫苗的敏感特性使其必须在低温下保存。
And immunisation requires repeated vaccinations.
并且要想实现免疫还需要反复接种。
Today polio is endemic in only four countries: Afghanistan, India, Nigeria and Pakistan. Ithas, however, re-emerged in several others .
目前脊髓灰质炎仅在四个国家流行:阿富汗、印度、尼日利亚和巴基斯坦。但此病在其它几个国家也曾死灰复燃。
Each endemic country has its own particular problems.
每个疾病流行的国家都有自己特殊的问题。
In Afghanistan the GPEI has failed to stop transmission in 13 war-ridden southern districts.
在战火纷飞的13个阿富汗南部地区,全球根除脊髓灰质炎行动没能够阻止疫情的传播。
Most of India is free of the disease, but the states of Uttar Pradesh and Bihar continue tostruggle.
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