On Friday, an eighth child was confirmed dead following the viral outbreak, but officials say they do not now have laboratory confirmation of adenovirus in this child that's killed other pediatric patients at the facility.
The new diagnosis of adenovirus brings the total number of cases at the rehabilitation centre to 26.
Adenovirus frequently causes mild to severe illness with cold-like symptoms, particularly in young children.
The US health department said the most recent individual to be diagnosed in the outbreak would have fallen ill on or before 22 October. The department can not confirm that the death of an individual who died Friday afternoon was related to the outbreak, officials said.
New Jersey health officials are sending infection-control teams to four long-term pediatric centers and a hospital to assist with training amid viral and bacterial outbreaks that killed a combined 10 people.
This remains the last day when a patient showed new symptoms.
"To date, confirmed cases became ill between September 26 and October 22", according to a health department statement.
A general look of the marquee outside of the Wanaque Center For Nursing And Rehabilitation, where New Jersey state Health Department confirmed the 18 cases of adenovirus, Tuesday, Oct. 23, 2018, in Haskell, N.J.
"As part of an ongoing effort to ensure all infection control measures are followed, we are taking extra steps to monitor residents and staff for any signs of infectious illness", Elnahal explained.
The strain found in the rehab center outbreak - type 7 - is among the more potent types and sometimes causes more serious respiratory illness, especially among those with weak immune systems.
A ninth child has died at a New Jersey rehabilitation facility following a viral outbreak.
The state Department of Health Communicable Disease Service has been on site monitoring the outbreak.
The department said that the facility, which includes a pediatric center, had agreed not to admit new patients until the outbreak ended. The CDC is also investigating the outbreak.