Episode Details

The United States plans new rules for the movement of dairy cows between states because of concerns about a bird flu outbreak. 

出于对禽流感爆发的担忧，美国计划对各州之间奶牛的流动制定新规则。

The virus is called Type A H5N1. It has been found in over 30 different groups of cows across eight states. 

该病毒被称为 A 型 H5N1。 已在 8 个州的 30 多个不同的奶牛群中发现了这种病毒。 

Some inactive markers of the virus have been found in milk sold in stores. Inactive markers mean the virus is dead and cannot harm humans who drink the milk. 

在商店出售的牛奶中发现了一些非活性病毒标记。 不活跃的标记意味着病毒已经死亡，不会伤害喝牛奶的人。 

The concern is that the virus could mutate, or change. It could then possibly spread from cows or other animals to humans. Experts, however, believe the risk of that is low. 

令人担忧的是病毒可能会变异或改变。 然后它可能从牛或其他动物传播到人类。 然而，专家认为这种风险很低。 

After April 29, cows must have been tested and found to not have the virus before they are permitted to be moved between states. 

4 月 29 日之后，奶牛必须经过检测并发现没有携带病毒，然后才能获准在各州之间转移。 

The virus has been known by scientists to circulate among wild birds. It appears in other animals if they eat sick birds. Some animals that live near the sea have tested positive for the virus, including harbor seals and polar bears. Animals that eat grasses, such as cows and goats, have only recently been found to have the virus. 

科学家已知该病毒在野生鸟类中传播。 如果其他动物吃了病鸟，也会出现这种情况。 一些生活在海边的动物的病毒检测呈阳性，包括斑海豹和北极熊。 直到最近才发现牛和山羊等吃草的动物携带这种病毒。

Richard Webby is an influenza expert at St. Jude’s Children’s Research Hospital in Tennessee. He said flu viruses are known for adapting to spread among new animals. Find