PITTSBURGH State and Allegheny County health officials say at least six measles cases in Western Pennsylvania have been traced to a traveler from India who infected the patients last month.

Health officials aren't identifying the traveler or the six people infected so far. Official suspect there are other measles cases that have yet to be confirmed.

But officials are letting people know when and where they might have come into contact with the disease, either through contact with the traveler or those who were infected by him.

They include the emergency rooms at UPMC Children's Hospital and the Alle-Kiski Medical Center, a conference for EMS workers at Seven Springs Mountain Resort in Somerset County, and several public transit buses in Pittsburgh, all late last month.