The child, whose name has not been released, died late Saturday night at the Wanaque Center for Nursing and Rehabilitation in Haskell, New Jersey.
An eighth child's death on Friday afternoon was associated with the outbreak, Leusner said. The department said later Monday there have been 26 adenovirus cases confirmed at the center.
"We are working every day to ensure all infection control protocols are continuously followed and closely monitoring the situation at the facility", said Health Commissioner Dr. Shereef Elnahal in a statement.
Adenoviruses, of which there are 52 different strains, are common causes of respiratory illnesses and most infections aren't severe, according to the CDC. Most were children, though at least one was a young adult; state officials have revealed minimal details to protect patient privacy. Many will never walk or talk, and some have spent virtually their whole lives there, according to the paper. A staff member also became ill but has recovered, the health department said.
"Facility outbreaks are not always preventable, but in response to what we have seen in Wanaque, we are taking aggressive steps to minimize the chance they occur among the most vulnerable patients in New Jersey", Elnahal said in a statement.
Adenovirus usually poses little risk for healthy people and typically causes mild cold or flu symptoms.
The Centers for Disease Control and Prevention is assisting with the outbreak at the facility, and the Department of Health Communicable Disease Service is on site as well.
A ninth person has died at a pediatric rehabilitation center amid an outbreak of a respiratory virus, New Jersey health officials said.
The department is continuing to investigate the outbreak.
The individuals associated with the outbreak became ill between September 26 and October 22, the Health Department said.
One of the teams will be deployed to the Wanaque Centre for Nursing and Rehabilitation in November.
The bacterium can cause pneumonia or serious blood or wound infections.
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