NEW BRUNSWICK, NJ - The state's health commissioner said she was surprised to see a spike in number of positive coronavirus COVID-19 cases in Middlesex County.

Judy Persichilli said during an afternoon teleconference with Gov. Phil Murphy, several state officials and reporters that seven of the 19 new cases in New Jersey are from Middlesex County.

She said the rise in reported cases in the county may be linked to a new testing center at Robert Wood Johnson University Hospital.

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"As far as the spike, we were surprised to see that as well," Persichilli said. "We did see that most of them came from Robert Wood Johnson's labs and that's a new lab that was just approved to do the testing. So, that may have been how they have batched and were sent on."

Murphy followed up by saying, "They just came on board Thursday as a new testing locale  and that may have well skewed the data for that.reason."

A spokesman confirmed Thursday that the hospital was treating two positive cases of coronavirus COVID-19.

There were no new cases at the hospital as of Friday morning.