考研英语阅读篇章: 美国发现被遗忘的瓶装天花病毒
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Long forgotten vials of smallpox left in a cardboard box have been
discovered by a government scientist at a research centre near Washington,
officials say.
一位政府科学家在华盛顿附近一座研究中心的一个纸箱中发现被人们长期遗忘的瓶装天花病毒。
The virus, believed dead, was located in six freeze-dried and sealed vials,
according to the Centers for Disease Control and Prevention (CDC).
It is said to be the first time unaccounted-for smallpox has been
discovered in the US.
The disease was officially declared eradicated in the 1980s.
"The vials appear to date from the 1950s. Upon discovery, the vials were
immediately secured in a CDC-registered select agent containment laboratory in
Bethesda, ," according to a CDC statement.
"There is no evidence that any of the vials labelled variola(天花) has been
breached, and onsite biosafety personnel have not identified any infectious
exposure risk to lab workers or the public," the statement added.
Government agencies were notified of the discovery on 1 July, after
National Institutes of Health (NIH) employees discovered the vials labelled
"variola", also known as smallpox.
The vials were located in an unused area of a storage room in a Food and
Drug Administration laboratory on an NIH campus in Bethesda.
The vials were subsequently transported to a secure facility in Atlanta,
Georgia, on 7 July.
Tests will be conducted on the material to determine if it is viable before
it destroyed, the CDC said.
The virus may remain deadly even after freeze-drying, though is it
typically kept cold to remain alive.
The CDC also notified the World Health Organization (WHO) of the discovery.
The WHO currently oversees two designated repositories(贮藏室) for smallpox; one in
Atlanta as well as one in Novosibirsk, Russia.
It is the not the first time vials of smallpox have been unexpectedly
discovered. Several were found at the bottom of a freezer in Eastern Europe in
the 1990s, according to media reports.
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