Theileriosis
Guides
Haemaphysalis longicornis
Asian longhorned tick, longhorned tick, bush tick, cattle tick, Asian tick
Haemaphysalis longicornis is an invasive three-host tick native to temperate East Asia that has established populations in Australia, New Zealand, the Pacific Islands, and the United States. First detected in New Jersey in 2017, it has since spread to at least 19 U.S. states. The species exhibits facultative parthenogenesis, with all-female populations documented in northern Japan, Russia, and the U.S. It is a significant veterinary pest of livestock, particularly cattle, and has been shown to transmit multiple pathogens to animals. While associated with various human tick-borne diseases in its native range, human pathogen transmission has not been confirmed in North America.
Ixodes affinis
Ixodes affinis is a hard-bodied tick species distributed across the southeastern United States, Mexico, Central America, and South America. Unlike its congener Ixodes scapularis, this species does not bite humans but serves as a competent vector for Borrelia burgdorferi sensu stricto, the causative agent of Lyme disease. Immature stages feed on birds and small mammals, while adults parasitize larger mammals including deer and dogs. Its expanding range into southeastern Virginia and association with migratory birds has raised concerns about its role in pathogen dispersal.
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