State health and agricultural officials are investigating reports of tainted milk at a western Pennsylvania dairy after at least six people have been sickened from drinking it.

Officials with the Brunton Dairy in Aliquippa say they're cooperating with the investigation.

The Pennsylvania Department of Health tells The Associated Press on Tuesday that six people have been confirmed to be ill from Yersinia bacteria, and a seventh case is being investigated.

According to the Centers for Disease Control and Prevention the bacteria can cause fever, abdominal pain and diarrhea four to seven days after exposure to it. The symptoms can then last from one to three weeks and, in a rare cases, the bacteria can enter the bloodstream and cause other complications.

The dairy about 25 miles northwest of Pittsburgh is certified to pasteurize milk, but has temporarily stopped production.

Copyright 2011 The Associated Press.