By Dan Levine, Julie Steenhuysen and Leah Douglas

WASHINGTON (Reuters) -Departing senior officials of the U.S. Centers for Disease Control and Prevention Deb Houry, Demetre Daskalakis and Dan Jernigan were escorted from the agency's Atlanta headquarters campus on Thursday morning, according to four sources familiar with the situation.

The three officials resigned on Wednesday, after the abrupt departure of agency head Susan Monarez. The White House said late Wednesday that Monarez was fired. Monarez's attorneys say her firing is illegal.

Houry was CDC Chief Medical Officer, Daskalakis was the National Center for Immunization and Respiratory Diseases Director, and Jernigan was the National Center for Emerging and Zoonotic Infectious Diseases Director.

(Reporting by Leah Douglas in Washington; Editing by Chizu Nomiyama )