Article: New anthrax cases force investigators to rethink theories.(Knight Ridder Newspapers)

WASHINGTON _ Confounding new anthrax cases led authorities Tuesday to revise blanket assurances that residential mail is safe.

Instead, Centers for Disease Control and Prevention director Dr. Jeffrey Koplan described the risk as "very small, but not zero" if a letter had somehow come in passing contact with another letter containing anthrax.

The revised view stems from two cases, one in New York, one in New Jersey, of anthrax victims who are not postal workers, don't distribute mail in their work, and touch only average volumes of mail. Neither victim is known to have received a letter containing anthrax.

Before the two cases came to light, ...

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