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Dr. Nancy Snyderman, NBC's chief medical editor and correspondent, apologized for violating the voluntary isolation agreement she made after she was exposed to Ebola.

(Courtesy of Peter Kramer | NBC)

PRINCETON — The director of the Centers for Disease Control and Prevention told CNN that Dr. Nancy Snyderman did not put the public at risk when she broke a voluntary isolation agreement after exposed to Ebola.

“If she was not sick, she was not putting others at risk,” Dr. Thomas Frieden said when he appeared on CNN's “Situation Room With Wolf Blitzer."

Snyderman, a Princeton resident and NBC's chief medical editor and correspondent, apologized Monday night for violating the agreement she made with the CDC, state and local officials. She remains symptom-free; the virus can only spread when someone who has it exhibits symptoms.

"As a health professional I know that we have no symptoms and pose no risk to the public, but I am deeply sorry for the concerns this episode caused," she said.

Read her full apology here.

A mandatory quarantine was issued Friday by New Jersey health officials for Snyderman, 62, and other NBC crew members who were exposed to Ebola when reporting in Liberia about the outbreak. The quarantine is in effect until Oct. 22, and the Princeton police and health departments are monitoring the situation in Snyderman's neighborhood, administrator Bob Bruschi said.

Ashoka Mukpo, a freelance cameraman with the team, was infected with the disease and is being treated in Omaha, Nebraska. Princeton Health Officer Jeffrey Grosser said Monday night Mukpo contracted Ebola when he was washing down a vehicle that had transported "bodies that perished from the disease."

A Providence, Rhode Island resident, Mukpo was infected with the disease on Oct. 1. NBC announced the rest of its crew working with him would voluntarily be isolated for three weeks.

Those exposed to the virus develop symptoms two days to three weeks after exposure, according to the CDC. It is transmitted through contact with blood and bodily fluids.

New Jersey Health Commissioner Mary O'Dowd asked hospitals throughout the state to conduct Ebola drills by Friday to determine how prepared emergency departments are in the event patients showing symptoms came through their doors. Officials at facilities in Mercer County said staff are ready and will continue education efforts this week.

Nicole Mulvaney may be reached at nmulvaney@njtimes.com. Follow her on Twitter @NicoleMulvaney. Find The Times of Trenton on Facebook.