Earlier, he said the employee who opened the letter was "doing well, " and that, so far, no one in his office has tested positive for the disease.
In addition, more than 1, 000 people who were either working in the Hart building or were in it when the letter was opened showed up for testing for anthrax and were given a three-day prescription of the antibiotic Cipro as a precaution.
The second letter to the mayor was opened by Mark Glaze, director of Mayors Against Illegal Guns -- founded and co-chaired by Bloomberg -- in Washington on Sunday.
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Shortly after the show opened, I received a letter from Dr. Howard Rusk, founder of the Rusk Institute, complaining that I had maligned Puerto Rico in the verse, that in fact the island had a very low incidence of tropical disease.
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This time, the letter was opened in Senator Daschle's second-floor suite in the Capitol itself.
The building has been closed since October 17, two days after the letter was opened.
About 50 people who were in Daschle's office at the time the letter was opened have begun a prophylactic regimen of antibiotics, Nichols said.
Rupert said the same chlorine dioxide treatment will be used on the building's heating, ventilation and air conditioning system (HVAC), where spores had been found after the letter was opened in Daschle's office.
That letter was opened at the city government's mail facility, in a biochemical containment box.
But members of the New York Police Department emergency service unit who came in contact with the letter that was opened at a city mail facility were examined for "minor symptoms" of ricin exposure that they experienced on Saturday, according to Paul Browne, NYPD spokesman.
"The bankruptcy system would be opened to abuse, " the industry groups said in a letter to the Senate Judiciary Committee last month.
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Last Wednesday, the judge received and opened a typewritten letter -- postmarked from Memphis, without a return address -- that included "suspicious content, " Lee County Sheriff Jim Johnson told reporters.
The letter to Daschle's office was opened a week ago Monday.
The letter to the mayor's organization was opened by Mark Glaze, director of Mayors Against Illegal Guns, in Washington on Sunday.
The letter was received at Daschle's office Friday and opened Monday morning.
When a letter landed on my desk addressed to the BBC Technical Correspondent, I opened it with care.
The other week, men and women across California opened up their mailboxes to find a letter from Anthem Blue Cross.
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