PITTSBURGH (KDKA) — Sources tell KDKA there is no evidence of what experts call a “single unifying source” of mold at UPMC Presbyterian Hospital.

The final report will take weeks.

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But the CDC believes there are several different possible sources for the infections.

Sources confirm hundreds of tests for mold have been conducted. Everything was looked at from bedsheets to bathrooms, ceiling tiles to food trays and even dirt outside the building was tested.

At this point, sources confirm a single source of the mold that caused the fungal infections has not been found.

UPMC Chief Medical Officer Dr. Steve Shapiro said two weeks ago:

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“We’ve been tirelessly testing hundreds of mold cultures around the clock, had we found something we would have fixed it.”

Four patients contracted mold infections at UPMC in the last year, three patients died. A fourth patient remains hospitalized.

In a statement released Friday referring to the patients, the CDC says “two had pulmonary fungal infections, one had a cutaneous fungal infection (skin), one had a disseminated infection.”

We spoke to the CDC recently and they said, “We make recommendations to the institution about how they can stop the outbreak or improve the circumstances. Finding as much as possible the cause of an outbreak and trying to stop that outbreak.”

Meantime, UPMC transplant programs are fully operational again.

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