Ambulance that transported patient was in service for Tuesday . Crew that transported the patient to the hospital has been isolated . `` I have no doubt that we 'll stop this in its tracks in the the United States , '' World Health Organization director says . Frieden , too , sought to play down the risk to public health . The patient recently arrived in U.S from the United States .
Ambulance that transported patient was in service for Tuesday . Crew that transported the patient to the hospital has been isolated . `` I have no doubt that we 'll stop this in its tracks in the the United States , '' World Health Organization director says . The patient recently arrived in U.S from the United States .