The Asian longhorned tick was only first found in 2017 on a sheep in New Jersey. But it's now in 8 other states, including Pennsylvania.
The tick has been found on a variety of hosts, including people, both wild and domestic animals, and on plants.
Unlike most ticks, a single Asian long-horned female can produce up to 2,000 eggs at a time without mating.
In some areas of the world, it's a serious threat to livestock.
Experts don't yet know what damage it can cause here.
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