The Montgomery County Health Department identified locations and times where people may have been at risk for exposure:
Dental office of Sol Rosenberg, 632 Montgomery Ave., Narberth, between 9 a.m. and noon July 27.
Acme Market, 829 Montgomery Ave., Narberth, from July 27 to 29.
Whole Foods store, 339 E. Lancaster Ave., Wynnewood, from July 27 to 29.
Philadelphia International Airport, US Airways baggage claim for Terminals B and C, between 6 and 9:30 p.m. July 28.
Beach at Longport, N.J., July 30.
Office and waiting area of Delaware Valley Infectious Disease Associates, 100 E. Lancaster Ave., Wynnewood, between 11:30 a.m. and 2:45 p.m. Aug. 3.
Lankenau Hospital laboratory, 100 E. Lancaster Ave., Wynnewood, between 1:15 p.m. and 3:30 p.m. Aug. 3.
Measles can be transmitted by sneezing or coughing, or contact with nasal or throat secretions, or by contaminated objects. The virus can stay active and contagious on contaminated surfaces for as long as two hours. Officials said symptoms start about 10 days after exposure and last from one to two weeks.
More information about the illness and who may be at risk is available on the Health Department's website at health.montcopa.org
Contact staff writer Robert Moran at 215-854-5983 or firstname.lastname@example.org.