NEW YORK (AP) — The gulf between politicians and scientists over Ebola widened on Sunday as the nation’s top infectious-disease expert warned that the mandatory, 21-day quarantining of medical workers returning from West Africa is unnecessary and could discourage volunteers from traveling to the danger zone.“The best way to protect us is to stop the epidemic in Africa, and we need those health care workers, so we do not want to put them in a position where it makes it very, very uncomfortable for them to even volunteer to go,” said Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases.Meanwhile, Kaci Hickox, the first nurse forcibly quarantined in New Jersey under the state’s new policy, said in a telephone interview with CNN that her isolation at a hospital was “inhumane,” adding: “We have to be very careful about letting politicians make health decisions.”Saying the federal health guidelines are inadequate, the governors of New York and New Jersey announced a mandatory quarantine program Friday for medical workers and other arriving airline passengers who have had contact with Ebola victims in West Africa, and Illinois soon followed suit. Twenty-one days is the incubation period for Ebola.New Jersey Gov. Chris Christie on Sunday defended quarantining as necessary to protect the public and predicted it “will become a national policy sooner rather than later.”“I don’t believe when you’re dealing with something as serious as this that we can count on a voluntary system,” said Christie, who is expected to run for the Republican nomination for president in 2016.