US congressional leaders arranged for an unprecedented shutdown of the House and possibly the Senate yesterday after more than two dozen people in Senate Majority Leader Tom Daschle's office tested positive for exposure to a highly potent form of anthrax.
House Speaker Dennis Hastert said lawmakers would go home at days' end, and the buildings on one side of the Capitol complex submitted to a "methodical sweeping" to check for evidence of anthrax.
There was no immediate announcement from Senate leaders, as they grappled with the news that numerous aides to Daschle and two Capitol police officers had tested positive for exposure after being in the vicinity of an anthrax-laced letter opened in the senator's office.
Daschle spokesman Jay Carson said the tests "indicate exposure and not infection and there is a very clear distinction."
House Speaker Dennis Hastert announced plans to send lawmakers and staff home to permit health officials to conduct tests through the capitol complex, where more than 20,000 people work.
Five weeks after the worst terrorist strikes in US history killed more than 5,000 in New York and Washington, the discovery only added to anxiety in the US. Three government sources, all speaking on condition of anonymity, said preliminary testing indicated the anthrax found in Daschle's office had been refined enough so that it could be easily dispersed through the air. One said the anthrax was in a purified form that could be used as a weapon.
At a news conference in the Capitol basement, Hastert said a total of 29 people had tested positive for exposure in the Senate, including many aides to Daschle and two Capitol police officers.
He also said authorities had quarantined his fourth floor office in the Capitol, where his mail is processed and several of his aides have offices.
The tests were conducted after a letter sent to Daschle's office was found to contain a highly refined form of anthrax, suggesting it was produced by experts.
At a hearing before a Senate committee, Health and Human Services Secretary Tommy Thompson said more than 20 people had tested positive for exposure.
Asked about the particular strain in the Daschle letter, he said, "There's no question this is a very serious attempt at anthrax poisoning."
Scott Lillibridge, the health department point person on bioterrorism, said, "There's been some attempt to collect it, perhaps refine it and perhaps make it more concentrated. That seems certain."
Elsewhere in the country, four people are known to have contracted anthrax and nine others have tested positive for the bacteria.
About 100 ABC employees in New York were tested for exposure to anthrax spores as investigators tried to figure out how a 7-month-old boy visiting the network's newsroom contracted the disease.
Environmental tests were completed Tuesday at ABC headquarters to try to pinpoint the anthrax source, but it could be days before results are known.
More than 200 ABC employees were interviewed by investigators. While they were not tested directly for anthrax, nasal swabs were taken from 100 employees identified as having had contact with the baby or having been in the affected areas.
The FBI is investigating strong similarities in handwriting and style, including identical anti-American language, between the letter with anthrax sent to Daschle in Washington and a letter sent to NBC News television anchor Tom Brokaw in New York.
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