Deadly flu virus can be sent through the mail

[摘要] The reconstructed version of the influenza virus that caused the 1918 world pandemic will be mailed to registered laboratories that ask for it, despite previous assurances to the contrary. Critics say that the virus should never have been recreated in the first place, as it could escape and cause another pandemic. They say that giving the virus to more labs, not to mention sending it in the mail, adds to that risk. Others argue that such studies are safe, and can help to discover what made the virus so deadly.