Opinions Conflict

Opinions conflict on whether flu strain purposely included in test kits

Federal officials say they still don't know for sure whether a company deliberately included a deadly flu strain in a kit it sent to more than four-thousand labs around the world. But the director of the Centers for Disease Control and Prevention says it's almost inconceivable the company didn't know what it was dealing with.

The strain killed between one and four million people in 1957, and was included in kits that test a lab's proficiency in identifying viruses.

A doctor who works with the organization that directs the test says the company that put the kits together thought it was sending out an ordinary flu strain.