These patients' preexisting health issues, as well as their shared environment, may have facilitated the spread of adenovirus, according to the state health department.
Children are considered to be especially at risk for adenovirus, although most people infected with the virus will only develop mild symptoms.
"This strain has been particularly associated with disease in communal living facilities", the department said in a statement. A inspection team sent to the facility on Sunday found some "minor" hand-washing deficiencies, which could have contributed to the outbreak.
Nicole Kirgan, a spokeswoman for the health department, told Daily Mail Online in a statement that the outbreak was caused by adenovirus type 7.
"The Wanaque Center for Nursing and Rehabilitation has recently experienced some cases of the Adenovirus in its pediatric unit".
New Jersey Governor Phil Murphy said in a statement Tuesday that state and local health officials are working to contain the outbreak.
Adenoviruses can cause a wide range of illnesses such as common cold, sore throat, bronchitis, pneumonia, diarrhea, pink eye, fever, bladder inflammation or infection, stomach and intestine inflammation, and neurologic disease, according to the CDC.
The facility's pediatrics center cares for patients ranging in age from newborn to 22 years of age, according to its website.
PHOTO: Wanaque Center for Nursing and Rehabilitation in Haskell, N.J, is pictured in this undated image from Google.
New patients are being barred from going to the facility until the outbreak is over.
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