The New York State Department of Health confirmed on Monday that a University of Rochester student treated at Strong Memorial Hospital had measles.
The DOH said the student has since recovered and is not contagious.
The department said a majority of people who were in the hospital at the same time as the patient and may have been exposed are not at-risk due to immunity either due to vaccination history or age.
Three other confirmed cases of measles were recently reported in Albany, Rensselaer and Rockland.
The DOH said that if a patient or visitor at Strong Memorial Hospital was in the emergency waiting room, treatment areas or extended observation unit from Jan. 31 to Feb. 1, and has not been immunized against measles, they may be at risk of contracting the illness and should contact their healthcare provider.
The University of Rochester is developing a course of action to prevent the spread of the illness and joining with Strong Memorial Hospital to notify at risk persons.
Measles is highly contagious disease that affects the respiratory system. It is spread through nasal or throat secretions, and can lead to serious side effects and, in some cases, death. Symptoms include runny nose, cough fever, red and sensitive eyes, small bluish white spots inside the mouth and rash that begins on the face.