Second US Screwworm Case Confirmed in Texas by USDA (1)

A second case of the deadly New World screwworm parasite has been confirmed in a Texas calf, heightening fears of a broader outbreak that could impact the US beef business.

A one-month-old calf tested positive in Zavala County, the US Department of Agriculture said in a statement late Friday. The infected animal is about 5.6 miles away from a confirmed case earlier this week, which marked the first time the pest had been detected in the US in about a decade.

The parasitic fly’s arrival in the US marks the latest hurdle for the domestic beef industry, with meatpackers and ...