Here's a thread where we discussed it. See esp. T.G.S's and my posts:
Czech Officials Say Story That Atta Met with Iraqi Agent in Prague May Be Wrong
And here's a follow-up article from the Czech press, much to hesitant to challenge the Western press it finds (or hopes) is "prestigious."
Czech Minister Doubts US Reports Questioning Atta's Contacts With Iraqi Agent
If there is disinfo going out there, the issue, for one, where the Anthrax came from, or its history, is surely an issue uncomfortable to someone.
Isikoff was the vehicle for the disinformation. But it is likely that it was somebody in an official position of some sort who gave him the story.