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Although they have been eradicated from most of the United States since the 1940s, southern cattle ticks (Rhipicephalus (Boophilus) microplus), also known as cattle fever ticks, still persist in five southern Texas counties that border Mexico. One way that the ticks are moving from Mexico into the United States is on cattle that swim across the narrow Rio Grande river that separates the two countries. Cattle fever ticks carry parasites that cause the often-deadly bovine disease of cattle fever, and, alarmingly, the ticks are now also becoming resistant to pesticides. (Photo by Brian Rich, Texas A&M Department of Entomology)

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