biological weapon

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"No shrewd user" of a biological weapon "is going to give you that opportunity," he warned.
“没有一个精明的生物武器使用者会给你那个机会，”他警告说。
Others, including the US and Russia, argue for more research in case smallpox returns, possibly as a biological weapon.
其他国家，包括美国和俄罗斯，都在争取通过研究天花病毒，获得更多的回报，并很有可能变成生物武器。
However, plague outbreaks following use of a biological weapon are a plausible threat.
然而，伴随着生物武器的使用，鼠疫爆发流行却是个并非遥远的威胁。
chinafanyi.com

"I think that the biggest strategic threat to the United States faces today is the possibility of another 9/11 with a nuclear weapon or a biological agent of some kind."

It's okay for chemical weapons it's okay for biological weapon at the toxin and bacteriological, but not the viral.
CENTERFORSECURITYPOLICY: Remarks to the Council on Foreign Relations
In unfriendly hands, these missiles could deliver a nuclear, chemical or biological weapon on the United States from anywhere on earth.
CENTERFORSECURITYPOLICY: Center for Security Policy Christopher-Perry Join The Debate On Missile Defense: Will The House Defend Clinton’s Program — Or Defend America?

a weapon that uses living matter such as bacteria to cause damage or death to people, animals, or crops