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An American freelance cameraman working for NBC News in Liberia tested positive for the Ebola virus, NBC News reported Thursday.Watch the report | What to know: EbolaThe freelance cameraman, Ashoka Mukpo, 33, was hired Tuesday to work with Dr. Nancy Snyderman, who is with three other NBC News employees on assignment in Monrovia, NBC News reported.Mukpo, who lists his hometown as Providence, Rhode Island, developed symptoms on Wednesday and quarantined himself before seeking medical advice. He went to a treatment center Thursday morning and a positive test result came back 12 hours later, according to NBC News."We are doing everything we can to get him the best care possible," NBC News President Deborah Turness said in a note to staff. "The rest of the crew, including Dr. Nancy (Snyderman), are being closely monitored and show no symptoms or warning signs. However, in an abundance of caution, we will fly them back on a private charter flight and then they will place themselves under quarantine in the United States for 21 days -- which is at the most conservative end of the spectrum of medical guidance."The cameraman is now the fourth American to contract Ebola since the outbreak in West Africa began.Nancy Writebol, Dr. Kent Brantly and Dr. Richard Sacra, of Massachusetts, were brought back to the United States for treatment and were later released.Thomas Eric Duncan remains in isolation at a Dallas, Texas, hospital as investigators trace his recent movements and who he had contact with.The Centers for Disease Control and Prevention is also monitoring the doctors and nurses who treated Duncan, as well as the three paramedics who brought him to the hospital in an ambulance.What's happening in Dallas is being closely watched by health professionals across the country. Boston public health experts are assuring the public that isolation rooms are ready, and protocols are in place to make sure symptoms of Ebola are not missed and mistakes aren't made if the virus shows up in Massachusetts."Our hospitals are all teaching hospitals," Dr. Anita Barry, of the Boston Public Health Commission, said. "You usually have three our four people who see the same patient. So if one person forgets to ask about their travel history, usually someone is going to remember it. And we've sent out alerts so they know how important it is to ask."