The facility is still not admitting any new patients and won't until the outbreak is over.
Health Department spokeswoman Donna Leusner said Thursday the person had already been ill so the diagnosis does not necessarily mean the virus is still spreading. Some strains also cause diarrhea and pinkeye.
The nine children who died in the outbreak that began September 26 range in age from toddler to young adult, with majority under age 18.
This month, NJ.com reported that in the center's most recent health inspection report, the Centers for Medicare & Medicaid Services gave the facility a "below average" score, and the 2017 report also said the facility "failed to ensure infection control practices were followed".
"Unfortunately, the particular strain of adenovirus (#7) in this outbreak is affecting medically fragile children with severely compromised immune systems".
The 227-bed, for-profit facility has a pediatric center and also cares for elderly residents. Adenovirus 7, in the outbreak is linked with communal living arrangements.
"Deeply saddened to report a 9th death from the Wanaque outbreak".
In rare cases among people with weakened immune systems, the viruses may cause pneumonia or inflammation of the brain and the tissues around it. Adenovirus is a respiratory virus that can cause mild or serious illness, though serious illness is less common. Type 7 is most commonly associated with acute respiratory disease, according to the CDC.
"Wash your hands frequently and avoid touching your face", she previously told CNN.
And the viruses are still hard to diagnose since they're not typically included in a panel of tests used to identify specific viruses, according to Schaffner.
"People know patients are being held prisoner, but they probably think they have bigger battles in public health to fight, so they just have to let this go", Sophie Harman, a global health expert at Queen Mary University of London, said.
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