Deadly Screwworm Parasite Found in US Threatens Cattle Herd (3)

A deadly cattle parasite was confirmed in the US for the first time in nearly a decade, posing the latest threat to a US herd already at its lowest level in 75 years.

The US Department of Agriculture confirmed late Wednesday that a suspected case from South Texas tested positive for the New World screwworm. The affected animal, a three-week-old calf in Zavala County, is the only case that the agency is tracking right now, Agriculture Secretary Brooke Rollins said on a call with reporters.

The agency is implementing quarantines, movement controls and surveillance in a 20-kilometer (12-mile) zone around ...