Dr. Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases and member of the White House’s coronavirus task force, told CNN he will begin a “modified quarantine” after making a “low risk” contact with the White House staffer who tested positive for the novel coronavirus.

The “low risk” assessment means he was not in close proximity to the person who tested positive during the time when that person was known to be positive for the virus.

He is not doing a full quarantine like Dr. Stephen Hahn, the commissioner of the Food and Drug Administration. Hahn came into contact with an individual who tested positive for coronavirus, an FDA official confirmed to CNN on Friday.

Dr. Robert Redfield, the director of the Centers for Disease Control and Prevention, will self-quarantine for two weeks after he was exposed to a person at the White House who tested positive for Covid-19, a CDC spokesperson confirmed to CNN.