Key Points
- The parasite was found in a 3-week-old calf decades after it was largely eradicated in the U.S. Authorities said the risk to humans is low. S1
- The U.S. Department of Agriculture says the New World screwworm fly has reached South Texas, marking the first time in decades that the parasite has threatened the nation's cattle industry. S2
- A calf near the US-Mexico border is the first case of the parasite in the US in 60 years. S3
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