US Senator Mr Tom Daschle, the target of an anthrax-laden letter, said 31 people in Congress had tested positive for exposure to the deadly bacterium.
Not all of them were members of his own staff, the Senate majority leader told a press conference.
A letter containing anthrax powder was opened on Monday by members of Mr Daschle staff in his Senate office.
Mr Daschle said the 31 people had had positive test results from nasal swabs for anthrax spores.
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AFP