Alpha-gal-syndrome
Guides
Amblyomma
Bont Ticks
Amblyomma is the third largest genus of hard ticks (Ixodidae), comprising medium to large, often ornamented species. The genus is the sole member of the subfamily Amblyomminae and exhibits its highest species diversity in the Americas, where half of all species occur. Many Amblyomma species are medically significant as vectors of human and animal pathogens, including Rocky Mountain spotted fever, ehrlichiosis, anaplasmosis, and the agent of alpha-gal syndrome. The genus likely originated between South America and Antarctica approximately 48 million years ago, with subsequent diversification and dispersal into Australian and South American Gondwana.
Amblyomma americanum
Lone Star Tick, Northeastern Water Tick, Turkey Tick, Cricker Tick
Amblyomma americanum is a three-host hard tick native to eastern North America, notable for its aggressive host-seeking behavior and expanding geographic range. Adult females are distinguished by a silvery-white star-shaped spot on the scutum, while males display white streaks or spots at the shield margins. The species is the primary vector of Ehrlichia chaffeensis and Ehrlichia ewingii, and its bite can induce alpha-gal syndrome—a delayed allergic reaction to mammalian meat. Unlike many ticks, A. americanum exhibits active horizontal movement rather than passive questing, traveling up to 9 meters in 24 hours in field conditions.
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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