Ocean County health officials say that the state Public Health Environmental and Agricultural Laboratory performed the tests on the fox and released them to county officials on Tuesday.
The four-year-old girl suffered scratches on her arm, leg and lip in Saturday's attack, which occurred at a home in Lakewood. She will receive a rabies-prevention treatment for 14 days and officials will closely monitor her condition.
The fox hid under a deck after attacking the girl and it later tried to attack police officers. An officer then shot the fox to death.
The child's name has not been released.