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The uncertainty about how [Kathy T. Nguyen] contracted the disease or how large a dose of anthrax spores she inhaled raises new worries that anthrax spores may have been released by means other than the mail.

[Edgar Larson] oversaw animal studies on anthrax for the U.S. military's germ warfare program, which ended in 1969. He said the studies were used to predict the dose of anthrax spores needed to infect humans with the inhaled form of the disease.

Photo(s); 1. A puzzling N.Y. case: Mayor [Rudolph W. Giuliani] conducts a City Hall briefing on the latest anthrax death. 2. "All bets are off": "We need to do ... a full-court press on trying to track this down," says Dr. [Anthony S. Fauci]. "This is critical." 3. Her home in the Bronx: No trace of anthrax was found at Kathy T. Nguyen's apartment in the Bronx (top window above door) or at her workplace, a hospital stockroom in Manhattan. 4. Anthrax victim: A family photograph shows Kathy T. Nguyen about 1986.; Credit: 1. - 3. ASSOCIATED PRESS 2. ASSOCIATED PRESS 4. AGENCE FRANCE-PRESSE