"Ongoing surveillance continued during the winter and on April 17, 2018, the National Veterinary Services Laboratory confirmed the Longhorned tick successfully overwintered in New Jersey and has possibly become established in the state," it was stated in a news release.
Last summer, a farmer walked into the Hunterdon County health office covered in thousands of the ticks after she was shearing a 12-year-old Icelandic sheep named Hannah. Experts were called in to identify the tick which was not previously known to exist in the United States. The Department of Agriculture says it still does not know how the tick made its way to New Jersey.
The sheep has never traveled internationally and has rarely left Hunterdon County, according to Andrea Egizi, a tick specialist at the Monmouth County Tick-borne Disease Lab.