Health officials in central Montana have confirmed a measles case and are warning people who were at an Amtrak stop in Malta or a wood products business in Moore in late September that they may have been exposed. The alert comes as North Dakota separately warns passengers who rode the same westbound Empire Builder route through Minot.
Train exposures are especially hard to trace. The Empire Builder makes dozens of stops across eight states, and passengers often do not know they shared a car with someone contagious. People far from Montana may need to watch for symptoms into mid-October.
