The United States has begun vaccinating all Gulf War troops against Anthrax. The United Nations has said it has evidence Iraq has been hiding biological weapons and the United States and Britain both contend there is evidence that Iraqis were growing anthrax for use in weapons. Most of the concern about biological weapons has been with regard to troops in the Gulf but Minnesota state epidemiologist Michael Osterholm told MPR's Gary Eichten, bioterrorism is a real threat to Americans at home, and public health authorities are not prepared: State epidemiologist Michael Osterholm speaking with Minnesota Public Radio's Gary Eichten. Their hour-long discussion will be repeated at 9:00