( CNN ) -- A retired American doctor who was working with Ebola patients in West Africa returned to the United States -- and put himself in quarantine . Dr. Alan Jamison volunteered in the Liberian capital of Monrovia this month as part of an international medical group . He returned to the United States on July 25 , according to Medical Teams International , the organization he worked with . MTI declined to discuss details of how Jamison traveled back to the United States , including whether he was on a commercial flight . Jamison , 69 , said he 's had no symptoms of the deadly virus , but has been in seclusion since he returned to his hometown of Morristown , Tennessee . He plans to be in isolation for 21 days , which is the incubation period for the disease -- or the time between infection and onset of symptoms . `` My last encounter with a patient who had Ebola was on July 19 , '' he said . `` I contacted the Centers for Disease Control and Prevention on my arrival ... and informed them I had been in West Africa and my history . '' The father of three said his daughter picked him up from the airport and dropped him at home , where he 's quarantined himself and has had no contact with anyone since . `` I 'm feeling normal and doing the typical things a person would do in their home , '' he said. `` I have my family who can bring me food if I need anything , and they would not enter the house . They can leave items outside the home . '' Ebola spreads through contact with organs and bodily fluids such as blood , saliva , urine and other secretions of infected people . Patients are only contagious when they show symptoms , not during the incubation period , according to the World Health Organization . `` I was not concerned that I was contagious when I left Africa , and not concerned at this time because I have no symptoms of the disease , '' Jamison said . The retired pediatrician said he was volunteering with Medical Teams International . `` It was very stressful and emotional to see these things in Liberia , '' Jamison said . Liberia is one of three nations battling an outbreak of Ebola . The World Health Organization says Ebola has been confirmed or suspected to have infected more than 1,300 people , with more than 700 deaths in West Africa this year . So far , the disease has been confined to Liberia , Sierra Leone and Guinea . One man died in quarantine in Nigeria after leaving Liberia . Two American medical workers infected in West Africa will receive treatment in Atlanta . Dr. Kent Brantly arrived in Georgia on Saturday aboard a specially equipped plane and was taken to Emory University Hospital . The plane is headed to Liberia to retrieve the other American , fellow missionary Nancy Writebol . The treatment of the patients will be conducted under strict safety protocols , U.S. officials said . There 's no cure for Ebola . The most common approach is to support organ functions and keep up bodily fluids such as blood and water long enough for the body to fight off the infection . Despite the risks , Jamison said he 'd return to West Africa to help combat Ebola . Questions about the Ebola outbreak .
Dr. Alan Jamison says he volunteered in the Liberian capital of Monrovia . He returned to the United States on July 25 . He plans to be in isolation for 21 days . Two American medical workers have been infected with Ebola in West Africa .