Six young patients died and 12 others became sick following an outbreak of adenovirus at a rehabilitation center in Haskell, New Jersey, the state's Health Department said on Tuesday.
The health department had earlier confirmed 18 cases of the virus.
The facility has been told it can't admit any new patients until the outbreak ends.
The Department visited the facility Sunday and only found "minor" hand washing deficiencies.
"This is an ongoing outbreak investigation", the department said in its statement.
The facility notified the state's health department of respiratory illnesses October 9.
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WCBS 880 has reached out to the Health Department for more information.
The Health Department didn't release the ages of the victims or address the severity of the illness in the other dozen cases. While they typically cause mild illnesses, people with weakened immune systems or existing respiratory or cardiac disease are at higher risk of developing a severe illness.
A team from the health department is at the facility and an inspection team was there Sunday, as well.
The facility's pediatrics center serves newborns to 22-year-olds who are "medically fragile" and provides an individualized program for each child, the center's website said. Messages left with the center were not returned. "The Wanaque Center continues to fully cooperate with these agencies and has sought out their medical guidance with respect to the virus".
Local news site NewJersey.com reported that a letter had been sent to parents of patients about an outbreak on 18 Oct, but officials did not confirm any details about the virus until Tuesday.