Dr. Anthony Fauci, the longtime director of the National Institute of Allergy and Infectious Diseases, is set to enter a "modified quarantine." 

The health expert told CNN on Saturday he decided to make the move after having "low-risk" contact with a White House staffer who tested positive for coronavirus. Fauci explained he wouldn't undergo a full quarantine because he was not in close proximity to the individual when he/she was known to be positive for the disease.

Fauci, who is also a member of the White House Coronavirus Task Force, did not identify the infected staffer; however, his announcement came just a day after Katie Miller, the press secretary for Vice President Mike Pence, tested positive for COVID-19. One of Donald Trump's personal valets also reportedly contracted the virus, along with Ivanka Trump's personal assistant.

Fauci told CNN he will try to work from home, continually wear a mask, and undergo daily tests for the next two weeks. If he is called to the White House, he "will go while taking every precaution."

The Food and Drug Administration Commissioner Stephen Hahn and Centers for Disease Control and Prevention Director Robert Redfield are also taking stricter measures. The two confirmed Saturday they will be fully quarantined over the next 14 days after coming into contact with someone who tested positive for coronavirus. Just like Fauci, Hahn and Redfield have not named the infected individual.