Allegheny County Health Department officials said five confirmed cases of E. coli have been discovered in customers and employees of a restaurant in Oakland.

According to a news release issued Wednesday afternoon, all five people diagnosed with the infection ate or worked at The Porch at Schenley on Schenley Drive.

The strain found in each confirmed case is the E. coli O157:H7 strain of E. coli, a form of the bacteria that can cause serious illness.

All five people were diagnosed with E. coli infections on or after October 1. Of the five people, four of them had to be hospitalized.