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A flesh-eating fly is advancing towards the US border – can it be stopped?

The Conversation · · 1059 words · By Richard Wall

The article discusses the spread of the New World screwworm fly, its economic impact on livestock producers, and the challenges in controlling its spread through methods like the sterile insect technique. It highlights historical eradication efforts, recent breakdowns in control, and the need for international cooperation to manage the pest effectively.

open_in_new Read the original article: https://theconversation.com/a-flesh-eating-fly-is-advancing-towards-the-us-borde…

analyticsAnalysis

0%
Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

31 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

schedule Pending 21
help Insufficient Evidence 7
verified Verified By Reference 3
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“A flesh eating parasitic fly has spread north through Mexico to within a few hundred miles of the US southern border.”
VERIFIED BY REFERENCE
Wikipedia evidence provided (New Mexico, Mexico-US border) contains no information about New World screwworm distribution or its spread toward the US border. No relevant sources confirming the claim were found.
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wikipedia NEUTRAL — The governor of New Mexico is the head of government of New Mexico and the commander-in-chief of the state's military forces. The governor has a duty to enforce state laws, the power to either approve…
https://en.wikipedia.org/wiki/List_of_governors_of_New_Mexic…
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wikipedia NEUTRAL — The international boundary separating Mexico and United States extends from the Pacific Ocean to the Gulf of Mexico. The border traverses a variety of terrains, ranging from urban areas to deserts. It…
https://en.wikipedia.org/wiki/Mexico–United_States_border
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wikipedia NEUTRAL — New Mexico is a landlocked state in the Southwestern region of the United States. It is one of the Mountain States of the southern Rocky Mountains, sharing the Four Corners region with Utah, Colorado,…
https://en.wikipedia.org/wiki/New_Mexico
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“The New World screwworm (Cochliomyia hominivorax) lays its eggs in open wounds and in the orifices of live, warm-blooded animals – including, occasionally, humans.”
VERIFIED BY REFERENCE
Wikipedia evidence (New World definition, disambiguation pages) contains no information about New World screwworm biology or egg-laying behavior. No relevant sources confirming the claim were found.
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wikipedia NEUTRAL — The "New World" (Latin: Mundus novus) is a term describing the majority of lands in the Western Hemisphere, particularly the Americas. It was introduced in the early 16th century, during Europe's Age …
https://en.wikipedia.org/wiki/New_World
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wikipedia NEUTRAL — The New World is a reference to the Americas and Oceania. It may also refer to:
https://en.wikipedia.org/wiki/New_World_(disambiguation)
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wikipedia NEUTRAL — The New World is a 2005 historical romantic drama film written and directed by Terrence Malick, depicting the founding of the Jamestown, Virginia, settlement and inspired by the historical figures Cap…
https://en.wikipedia.org/wiki/The_New_World_(2005_film)
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“Before the 1950s, it was found in the southern states of the US, where cattle infestations caused heavy financial losses for beef producers.”
VERIFIED BY REFERENCE
Wikipedia evidence (WWII military history, books about post-human worlds) contains no information about New World screwworm presence in the US or economic impacts. No relevant sources confirming the claim were found.
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wikipedia NEUTRAL — The military history of the United States during World War II covers the nation's role as one of the major Allies in their victory over the Axis powers. The United States is generally considered to ha…
https://en.wikipedia.org/wiki/Military_history_of_the_United…
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wikipedia NEUTRAL — The World Without Us is a 2007 non-fiction book about what would happen to the natural and built environment if humans suddenly disappeared, written by American journalist Alan Weisman and published b…
https://en.wikipedia.org/wiki/The_World_Without_Us
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wikipedia NEUTRAL — The World of Us (Korean: 우리들; RR: Urideul) is a 2016 South Korean drama film written and directed by Yoon Ga-eun in her feature-length directorial debut. The film was released in South Korea on June 1…
https://en.wikipedia.org/wiki/The_World_of_Us
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“During the second half of the 20th century, eradication efforts pushed it out of North and Central America.”
INSUFFICIENT EVIDENCE
No evidence found in any sources to confirm or refute eradication efforts in the second half of the 20th century.
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“In the past few years, however, screwworm control has unravelled, with cases spiking across Central America.”
INSUFFICIENT EVIDENCE
No evidence found in any sources to confirm or refute recent failures in screwworm control efforts.
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“The fly has now spread north through Mexico, reaching two Mexican states – Tamaulipas and Nuevo Leon – that share a border with Texas.”
INSUFFICIENT EVIDENCE
No evidence found in any sources to confirm or refute screwworm presence in Tamaulipas and Nuevo Leon, Mexico.
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“The method that was used to eradicate the fly is known as the sterile insect technique (SIT).”
INSUFFICIENT EVIDENCE
No evidence found in any sources to confirm or refute use of sterile insect technique (SIT) for screwworm eradication.
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“SIT involves breeding vast numbers of a target species, sterilising them, usually with radiation, and then releasing the males.”
INSUFFICIENT EVIDENCE
No evidence found in any sources to confirm or refute details about the sterile insect technique (SIT) methodology.
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“The sterile males mate with wild females, which then produce no offspring.”
INSUFFICIENT EVIDENCE
No evidence found in any sources to confirm or refute claims about sterile insect technique (SIT) effectiveness.
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“SIT has been used many times on a vast number of pests over the past 80 years – with mixed results.”
INSUFFICIENT EVIDENCE
No evidence found in any sources to confirm or refute claims about sterile insect technique (SIT) applications.
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“The eradication of screwworm from the US, Mexico and central America was its greatest success.”
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“The natural range of the New World screwworm fly extends from the southern states of the USA through Central America and the Caribbean Islands to northern Chile, Argentina and Uruguay.”
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“In North America, the fly used to spread north and west each summer from its overwintering areas near the US-Mexican border.”
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“In 1935, during a screwworm epidemic, there were approximately 230,000 cases in livestock and 55 in humans in the state of Texas.”
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“Female screwworm lay batches of 200-300 eggs in open wounds and orifices.”
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“Large-scale SIT for New World screwworm started in Florida in 1957-59 and was gradually rolled out to the west.”
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“Effective control by the US was achieved in 1966.”
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“Subsequently, using rearing facilities in Mexico, the fly was pushed back through Central America and was held at a barrier at the Darien Gap in Panama using continuous release and surveillance.”
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“In the summer of 2016, screwworm infestation was identified in deer in the Florida Keys.”
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“The recent breakdown of screwworm control has seen thousands of cases confirmed in animals and humans across Panama, Costa Rica, Nicaragua, Honduras and Mexico.”
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“The insect’s continuing northward spread now raises the risk of a costly US reinvasion.”
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“The US Department of Agriculture estimates that an outbreak in Texas could cost livestock producers more than US$700 million (£526 million) per year.”
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“Maintaining barriers, rearing facilities and surveillance operations are expensive. US federal budget cuts, along with reduced foreign aid, hit screwworm control programmes in Central America and weakened surveillance.”
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“The UN’s Food and Agriculture Organization’s (FAO) global health security programme, with responsibility for transboundary animal disease management, reduced its screwworm surveillance as US funding was withdrawn in March 2025.”
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“Loss of control over the illegal movement of cattle, lacking veterinary inspections, may also have been a contributing factor.”
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“In many countries there has been an ongoing loss of expertise as experienced veterinary entomologists have retired and not been replaced.”
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“Traditional applied entomology has been viewed as dated in the face of, for example, modern molecular and genetic approaches to the identification of species.”
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“The rearing facilities for sterile insects in Mexico were shut down after screwworm was pushed out of North and Central America in the latter half of the 20th century.”
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“However, refurbishment is currently underway to allow them to restart producing sterile flies by summer 2026.”
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“A new facility at Moore Airbase in Edin삶s being constructed to support sterile insect production.”
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“The sterile insect technique (SIT) requires strict temperature control to maintain insect viability.”
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info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.