It will be another week before health officials will find out if the confirmed case of measles at the University of Minnesota has spread elsewhere.
The Minnesota Daily reports that the 20-year-old student, identified as the first confirmed measles case in Minnesota in 2015, passed the infectious stage of the highly contagious disease on Wednesday night.
The student is recovering off-campus, with health authorities now waiting to see if any more cases are confirmed, saying that residents of Sydney Hall may have been exposed between January 20 and 28. He also attended class between January 20 and 23.
"The people who are most at risk from this particular case would be those who may have been in classes with this student, or lives with this person,” Lynn Bahta, of the Minnesota Department of Health, told WCCO. "It can include people in the building, because the measles virus is small enough that is hovers … for up to two hours in the air."
The case comes as there are wider concerns about measles in the United States after an outbreak that started at Disneyland in December has now led to more than 100 confirmed cases across the country, Reuters reports.
In Minnesota, there were only two confirmed cases last year, down from more than 20 in 2011, while an outbreak of 400 cases in 1989 and 1990 led to three deaths, WCCO notes.
The U student, who recently returned from international travel, managed to contract the disease despite having had two doses of the MMR vaccine, FOX 9 reports.