A case of measles was confirmed in the city of Detroit, where health officials once again urged the public to make sure they are vaccinated against the highly infectious disease that has affected 44 people in Michigan this year.

The most recent case involves a man from Detroit who recently returned from a trip abroad and was treated in the emergency room at Children’s Hospital of Michigan from 12: 30-9: 30 p.m. Tuesday, according to the Detroit Department of Health.

Officials warn that visitors to the Children’s Hospital emergency room may have been exposed and urged people exposed to be vaccinated immediately.

The infected individual also went to his doctor’s office in Macomb County, although health officials said that other patients in that doctor’s office who might have been exposed had been notified.

“We are encouraging everyone who came to the Children’s Hospital emergency room on the afternoon of July 16 to make sure they have been vaccinated,” said the interim medical director of the Detroit Department of Health, Ruta Sharangpani, in a statement. “In general, the vaccine is the best way to protect yourself and others from this disease.”