A researcher working in a lab at the University of Pittsburgh in Pennsylvania has accidentally contracted the Zika virus from a needle stick, CNN reports. After infecting herself while performing experiments with the virus late last month, the woman noticed she had Zika-like symptoms. Further testing confirmed that she was positive for the virus. This is the first case of Zika in the United States that is not linked to travel or sexual transmission, according to the U.S. Centers for Disease Control and Prevention. It is the 691st confirmed case of Zika in the United States and the 23rd in Pennsylvania.