11.   The Post letter, like contaminated letters sent to Senate Majority Leader Tom Daschle and to NBC, was sent from Trenton, N.J., the authorities said.

12.   The postal workers are believed to have been infected by the contaminated letters sent to Washington.

13.   The stamps were shipped to Kansas City after a contaminated letter was delivered to offices of Senate Majority Leader Tom Daschle in Washington.

14.   The Trenton Processing and Distribution Center in Hamilton Township, which handled the first contaminated letters found in the country, remains closed because of extensive contamination.

15.   Yet it seems impossible to rule out that somewhere a contaminated letter may still cross the path of a highly susceptible person, with tragic consequences.

16.   All of the exposure was linked to a contaminated letter sent to Senate Majority Leader Tom Daschle.

17.   But he suggested that her mail may have somehow come in contact with contaminated letters.

18.   But information that led agents there was developed during the massive search for who mailed the contaminated letters, authorities said.

19.   In Nevada, health officials said four people who may have come into contact with a contaminated letter sent to a Microsoft office tested negative for anthrax.

20.   Investigators have converged on Trenton, New Jersey, where three contaminated letters were post-marked.