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What are New World screwworms?
New World screwworms are parasitic flies that lay their eggs in open wounds of mammals, including livestock and humans. The larvae feed on the host's tissue, leading to severe infections and even death if untreated. They were eradicated from the U.S. in the early 1980s but have recently re-emerged in southern Mexico.
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How is the USDA combating screwworms in Mexico?
The USDA is employing the Sterile Insect Technique (SIT) to combat the resurgence of screwworms in Mexico. This method involves releasing sterilized male flies into the wild to mate with females, resulting in no offspring and gradually reducing the population. This proactive approach aims to prevent the spread of screwworms into the U.S.
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What could happen if screwworms spread to the U.S.?
If New World screwworms spread to the U.S., it could lead to significant economic losses in the livestock industry, as infected animals may require costly treatments or even culling. Additionally, there are concerns about public health risks, as humans can also be affected by these parasites.
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Why is the USDA's action urgent?
The urgency of the USDA's actions stems from warnings by Agriculture Secretary Brooke Rollins about the potential for an outbreak in the U.S. as early as summer 2025. With ranchers increasingly concerned about the screwworm's return, immediate measures are necessary to contain the threat and protect both livestock and human health.
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What is the life cycle of a New World screwworm?
The life cycle of a New World screwworm begins when a female fly lays eggs in a wound. The eggs hatch into larvae, which feed on the host's tissue. After several days, the larvae drop to the ground to pupate, eventually emerging as adult flies. This rapid life cycle allows for quick population growth, making control efforts critical.