Superintendent Raymond Bandlow says the boy became ill last week and is well enough to return to school.
Meanwhile, a second student has also been tested. Results are not expected for several days.
State health officials have confirmed another case of swine flu involving a Bergen County resident. The man was diagnosed while in North Carolina. Essex County also has its first confirmed case.
That brings the total number of confirmed swine flu cases in New Jersey to 25. No one has died.
Confirmed cases are located in Bergen, Burlington, Hudson, Camden, Ocean, Essex, Monmouth and Somerset counties.
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Information from: The Record of Bergen County, http://www.northjersey.com
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