SEATTLE — Two emergency medicine doctors, in New Jersey and Washington State, are in critical condition as a result of coronavirus, reinforcing concerns that the nation’s front-line medical workers are becoming especially vulnerable to the virus, the American College of Emergency Physicians said.

“A lot of us think that despite everything we do, we will probably be exposed,” said Dr. William Jaquis, the chair of the group. Still, he said, “The first reported case certainly sends a shock wave through the community.”

Emergency rooms represent a busy intake point for hospitals, where patients come in with symptoms but no diagnosis. As the coronavirus spreads during the typical flu season, emergency physicians are triaging large numbers of patients around the country with symptoms that could be the virus.