Authorities in New Jersey say two premature babies with a bacterial infection have died.
The Department of Health is investigating the outbreak of A. baumannii at the University Hospital of Newark and said on Tuesday that the babies had confirmed cases of the bacteria.
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They died last week and were not identified.
It was reported that a third baby with the bacteria had died.
The department says the two babies contracted the infection six weeks ago, but had other medical conditions because they were born premature, which means that the bacterial infection may not be the cause of death.
The department says that a survey team is on the site and investigating the hospital's policies.
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State officials became aware of the infection last month when four cases were confirmed.
The fourth child was discharged last month.