Pennsylvanians who visited several locations in the Allentown area between October 7 and October 12 were alerted they may have been exposed to measles, according to the Pennsylvania Department of Health.

The locations and times when residents may have been exposed include: 

• 7350 Office Building, 7350 Tilghman St., Allentown, PA, 18106 on October 7 from 9:30 a.m. to 11:45 a.m.;

• 1251 S. Cedar Crest Blvd. Office Building, main lobby of the building, Allentown, PA, on October 7 from 2:30 p.m. to 4:35 p.m.;

• Quest Diagnostics, 1608 W. Allen St., Allentown, PA, on October 8 from 8:00 a.m. to 10:30 a.m.;

• Lehigh Valley Hospital, 1200 S Cedar Crest Blvd, Allentown, PA 18103, on October 12 from 9:15 a.m. to 11:45 a.m. in the proximity of the Emergency Department.

A patient in Lehigh Valley Hospital has a confirmed case of measles, Secretary of Health Dr. Rachel Levine said.

“The Department of Health is working with the Allentown Health Bureau and Lehigh Valley Health Network to notify Pennsylvanians who were in these locations during the identified times and areas," Levine said.

Anybody who believes they may have been exposed and experience symptoms can contact their health-care provider or call the toll-free hotline at 1-877-PA-HEALTH.

Measles is a highly contagious but vaccine-preventable disease that spreads through coughing, sneezing or other contact with the mucus or saliva of an infected person, according to the Pennsylvania Department of Health. Symptoms typically appear one to three weeks after exposure and include: rash; high fever; cough; and red, watery eyes.

According to the Centers for Disease Prevention and Control (CDC) those most at-risk are:

• Infants less than one year of age who are too young to have received the measles, mumps and rubella (MMR) vaccine;

• Individuals who refused vaccination; and

• Individuals from parts of the world where there is low vaccination coverage or circulating measles.

People can visit the Department of Heath's website for more information on measles.