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None of what’s been found is enough to definitively determine what caused the contamination, and the investigation is ongoing, Biondolillo said.

Meanwhile, Patrick’s moves to increase oversight at the state’s 25 compounding pharmacies have already started.

The first of the unannounced inspections, to take place at least annually, was done on Tuesday, health department spokesman Alec Loftus said. He wouldn’t give the inspected facility’s name and said the results are being reviewed.

Patrick said compounding pharmacies will now be required to file annual compliance reports that could help regulators determine if they are acting as manufacturers.

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Associated Press reporter Bob Salsberg contributed to this report.