{"id":3455,"date":"2026-07-09T20:06:03","date_gmt":"2026-07-09T20:06:03","guid":{"rendered":"https:\/\/denvermovingchronicle.com\/?p=3455"},"modified":"2026-07-09T20:06:03","modified_gmt":"2026-07-09T20:06:03","slug":"what-to-know-about-protecting-pets-from-the-new-world-screwworm-fly","status":"publish","type":"post","link":"https:\/\/denvermovingchronicle.com\/?p=3455","title":{"rendered":"What to know about protecting pets from the New World screwworm fly"},"content":{"rendered":"<div>\n<div>\n<div>\n<ul><\/ul>\n<\/div>\n<\/div>\n<p>Two New World screwworm cases in dogs are among more than 30 confirmed instances in Texas and New Mexico, prompting warnings Wednesday from veterinarians and humane societies that pet owners need to remain vigilant to protect their animals.<\/p>\n<p>The parasite reappeared in cattle in the U.S. in June, more than 50 years after it had been largely eradicated from the country. The pest is actually the larvae of the New World screwworm fly. It eats live flesh and fluids rather than dead material, as the larvae of most fly species do.<\/p>\n<p>Here is what to know about the parasite, the threat it poses to pets and how to protect them:<\/p>\n<p><strong>Screwworm fly larvae can infest any mammal<\/strong>\n<\/p>\n<div><\/div>\n<p>The fly\u2019s migration north from Panama starting in 2024, and through Mexico in 2025, has agriculture officials warning that it poses a threat to the $113 billion U.S. cattle industry, but the larvae can hatch and breed in any mammal, including wildlife, dogs, cats and occasionally humans.<\/p>\n<p>The problem develops when a female fly lays its eggs in open wounds and mucus. After the eggs hatch, the larvae feed for about a week before maturing, dropping to the ground and continuing to develop into an adult fly.<\/p>\n<p>The American Veterinary Medical Association says newborn animals and animals with open wounds or who have undergone surgery or other medical procedures recently are especially vulnerable. Even a tick bite can host an infestation, Aaron Grady, executive director of the Houston Humane Society shelter, said during a webinar on the screwworm.<\/p>\n<p><strong>Infestation signs include restlessness and bad smell<\/strong><\/p>\n<p>Animal health experts say pet owners in areas where the screwworm is present \u2014 southern and southwestern Texas and southeastern New Mexico so far \u2014 should watch their animals closely and examine them for wounds, cuts and bites regularly.<\/p>\n<p>Pet owners should look for any maggots or movement in a wound. Other signs include a foul smell and restlessness or anxiety in an animal, or an animal \u201chyper-fixating on looking or chewing in a certain area of the body,\u201d said Melissa Stansell, a veterinarian at the shelter Austin Pets Alive!<\/p>\n<p>Any one of those is reason enough to go to a veterinarian. The affected animal is likely in a great deal of pain, and that can cause death from shock. The larvae also can cause death if they move into vital organs or by causing infections that turn deadly.<\/p>\n<p><strong>Flea, tick medications can stop an infestation<\/strong><\/p>\n<p>Humane society officials and veterinarians said shelters across Texas are trying to prevent infestations in animals by giving them prescription flea and tick medications. They recommend that pet owners do the same.<\/p>\n<p>\u201cIt will kill the larvae as they ingest the blood and tissue,\u201d Stansell said. \u201cThe chemical compositions of those products are what kill the actual larval stages of these flies.\u201d<\/p>\n<p>Veterinarians also can treat infestations and animals can recover if pet owners contact them quickly. Stansell said the treatment could include antibiotics.<\/p>\n<p>\u201cIt is only fatal if left untreated,\u201d she said.<\/p>\n<p><strong>An effort to eradicate the fly again is underway<\/strong><\/p>\n<p>The New World screwworm fly is a tropical species and decades ago would disappear each year when colder weather arrived with the fall or winter.<\/p>\n<p>But state and U.S. Department of Agriculture officials aren\u2019t waiting for the weather to turn. They\u2019ve returned to an eradication method that worked decades ago, breeding sterile male flies and releasing them into the wild. The female New World screwworm fly mates once in her monthslong life, and if her partner is sterile, her eggs won\u2019t hatch \u2014 causing the population in an area to drop and then disappear.<\/p>\n<p>For years, the only factory breeding sterile flies in the Western Hemisphere was in Panama, but the USDA invested $21 million to convert a site in southern Mexico from breeding fruit flies to recently start breeding screwworm flies. The agency also plans to spend $750 million on a new fly factory in Texas, set to open next year.<\/p>\n<p>Read more <a href=\"https:\/\/denvermovingchronicle.com\/?p=3449\">Nominations open in the contest to be UK leader, with Andy Burnham likely the only candidate<\/a><\/p>\n<\/p>\n<\/p>\n<\/p>\n<\/p>\n<\/p>\n<p>Read more <a href=\"https:\/\/denvermovingchronicle.com\/?p=3451\">Family demands an independent probe after ICE officer fatally shoots a man in Houston<\/a><\/p>\n<\/p>\n<\/p>\n<\/p>\n<\/p>\n<\/p>\n<p>Read more <a href=\"https:\/\/denvermovingchronicle.com\/?p=3453\">Aurora traffic enforcement cuts crashes by 86% at crash-prone I-225 and Parker interchanges<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Two New World screwworm cases in dogs are among more than 30 confirmed instances in Texas and New Mexico, prompting warnings Wednesday from veterinarians and humane societies that pet owners need to remain vigilant to protect their animals. The parasite reappeared in cattle in the U.S. in June, more than 50 years after it had [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3454,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1101,1102,149,2170,1103,1104],"tags":[5549,3390,5550,3092,5551,5552],"class_list":["post-3455","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-0-no-apple-publish","category-1gridmagazine","category-a-town-magazine","category-pets","category-uncategorized","category-z-other-galley","tag-aaron-grady","tag-cattle-industry","tag-melissa-stansell","tag-new-world-screwworm-fly","tag-pet-owners","tag-veterinarians"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What to know about protecting pets from the New World screwworm fly - Denver Moving Chronicle<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/denvermovingchronicle.com\/?p=3455\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What to know about protecting pets from the New World screwworm fly - Denver Moving Chronicle\" \/>\n<meta property=\"og:description\" content=\"Two New World screwworm cases in dogs are among more than 30 confirmed instances in Texas and New Mexico, prompting warnings Wednesday from veterinarians and humane societies that pet owners need to remain vigilant to protect their animals. The parasite reappeared in cattle in the U.S. in June, more than 50 years after it had [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/denvermovingchronicle.com\/?p=3455\" \/>\n<meta property=\"og:site_name\" content=\"Denver Moving Chronicle\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-09T20:06:03+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/#\\\/schema\\\/person\\\/860d8c9be7e4969f72ed251197548d9b\"},\"headline\":\"What to know about protecting pets from the New World screwworm fly\",\"datePublished\":\"2026-07-09T20:06:03+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455\"},\"wordCount\":719,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/denvermovingchronicle.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/892b16867fda9302d28af78adfe31134.jpg\",\"keywords\":[\"Aaron Grady\",\"Cattle industry\",\"Melissa Stansell\",\"New World screwworm fly\",\"Pet Owners\",\"veterinarians\"],\"articleSection\":{\"0\":\"0 - No Apple Publish\",\"1\":\"1gridMAGAZINE\",\"2\":\"A-Town Magazine\",\"3\":\"Pets\",\"5\":\"z-other-galley\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455\",\"url\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455\",\"name\":\"What to know about protecting pets from the New World screwworm fly - Denver Moving Chronicle\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/denvermovingchronicle.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/892b16867fda9302d28af78adfe31134.jpg\",\"datePublished\":\"2026-07-09T20:06:03+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/#\\\/schema\\\/person\\\/860d8c9be7e4969f72ed251197548d9b\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455#primaryimage\",\"url\":\"https:\\\/\\\/denvermovingchronicle.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/892b16867fda9302d28af78adfe31134.jpg\",\"contentUrl\":\"https:\\\/\\\/denvermovingchronicle.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/892b16867fda9302d28af78adfe31134.jpg\",\"width\":1024,\"height\":682,\"caption\":\"Thousands of dyed fly pupae are seen in a sterile fly dispersal station placed by the U.S. Department of Agriculture to combat the spread of the New World screwworm fly on grounds of a ranch near La Pryor, Texas, Thursday, June 11, 2026. (AP Photo\\\/Eric Gay)\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?p=3455#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/denvermovingchronicle.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What to know about protecting pets from the New World screwworm fly\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/#website\",\"url\":\"https:\\\/\\\/denvermovingchronicle.com\\\/\",\"name\":\"Denver Moving Chronicle\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/denvermovingchronicle.com\\\/#\\\/schema\\\/person\\\/860d8c9be7e4969f72ed251197548d9b\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/50b1ad2e498f523425ee0a8cc5180a210646db1622662a3d56cc405d3e0c346a?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/50b1ad2e498f523425ee0a8cc5180a210646db1622662a3d56cc405d3e0c346a?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/50b1ad2e498f523425ee0a8cc5180a210646db1622662a3d56cc405d3e0c346a?s=96&d=mm&r=g\",\"caption\":\"admin\"},\"sameAs\":[\"http:\\\/\\\/denvermovingchronicle.com\"],\"url\":\"https:\\\/\\\/denvermovingchronicle.com\\\/?author=1\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"What to know about protecting pets from the New World screwworm fly - Denver Moving Chronicle","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/denvermovingchronicle.com\/?p=3455","og_locale":"en_US","og_type":"article","og_title":"What to know about protecting pets from the New World screwworm fly - Denver Moving Chronicle","og_description":"Two New World screwworm cases in dogs are among more than 30 confirmed instances in Texas and New Mexico, prompting warnings Wednesday from veterinarians and humane societies that pet owners need to remain vigilant to protect their animals. The parasite reappeared in cattle in the U.S. in June, more than 50 years after it had [&hellip;]","og_url":"https:\/\/denvermovingchronicle.com\/?p=3455","og_site_name":"Denver Moving Chronicle","article_published_time":"2026-07-09T20:06:03+00:00","author":"admin","twitter_card":"summary_large_image","twitter_misc":{"Written by":"admin","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/denvermovingchronicle.com\/?p=3455#article","isPartOf":{"@id":"https:\/\/denvermovingchronicle.com\/?p=3455"},"author":{"name":"admin","@id":"https:\/\/denvermovingchronicle.com\/#\/schema\/person\/860d8c9be7e4969f72ed251197548d9b"},"headline":"What to know about protecting pets from the New World screwworm fly","datePublished":"2026-07-09T20:06:03+00:00","mainEntityOfPage":{"@id":"https:\/\/denvermovingchronicle.com\/?p=3455"},"wordCount":719,"commentCount":0,"image":{"@id":"https:\/\/denvermovingchronicle.com\/?p=3455#primaryimage"},"thumbnailUrl":"https:\/\/denvermovingchronicle.com\/wp-content\/uploads\/2026\/07\/892b16867fda9302d28af78adfe31134.jpg","keywords":["Aaron Grady","Cattle industry","Melissa Stansell","New World screwworm fly","Pet Owners","veterinarians"],"articleSection":{"0":"0 - No Apple Publish","1":"1gridMAGAZINE","2":"A-Town Magazine","3":"Pets","5":"z-other-galley"},"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/denvermovingchronicle.com\/?p=3455#respond"]}]},{"@type":"WebPage","@id":"https:\/\/denvermovingchronicle.com\/?p=3455","url":"https:\/\/denvermovingchronicle.com\/?p=3455","name":"What to know about protecting pets from the New World screwworm fly - Denver Moving Chronicle","isPartOf":{"@id":"https:\/\/denvermovingchronicle.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/denvermovingchronicle.com\/?p=3455#primaryimage"},"image":{"@id":"https:\/\/denvermovingchronicle.com\/?p=3455#primaryimage"},"thumbnailUrl":"https:\/\/denvermovingchronicle.com\/wp-content\/uploads\/2026\/07\/892b16867fda9302d28af78adfe31134.jpg","datePublished":"2026-07-09T20:06:03+00:00","author":{"@id":"https:\/\/denvermovingchronicle.com\/#\/schema\/person\/860d8c9be7e4969f72ed251197548d9b"},"breadcrumb":{"@id":"https:\/\/denvermovingchronicle.com\/?p=3455#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/denvermovingchronicle.com\/?p=3455"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/denvermovingchronicle.com\/?p=3455#primaryimage","url":"https:\/\/denvermovingchronicle.com\/wp-content\/uploads\/2026\/07\/892b16867fda9302d28af78adfe31134.jpg","contentUrl":"https:\/\/denvermovingchronicle.com\/wp-content\/uploads\/2026\/07\/892b16867fda9302d28af78adfe31134.jpg","width":1024,"height":682,"caption":"Thousands of dyed fly pupae are seen in a sterile fly dispersal station placed by the U.S. Department of Agriculture to combat the spread of the New World screwworm fly on grounds of a ranch near La Pryor, Texas, Thursday, June 11, 2026. (AP Photo\/Eric Gay)"},{"@type":"BreadcrumbList","@id":"https:\/\/denvermovingchronicle.com\/?p=3455#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/denvermovingchronicle.com\/"},{"@type":"ListItem","position":2,"name":"What to know about protecting pets from the New World screwworm fly"}]},{"@type":"WebSite","@id":"https:\/\/denvermovingchronicle.com\/#website","url":"https:\/\/denvermovingchronicle.com\/","name":"Denver Moving Chronicle","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/denvermovingchronicle.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/denvermovingchronicle.com\/#\/schema\/person\/860d8c9be7e4969f72ed251197548d9b","name":"admin","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/50b1ad2e498f523425ee0a8cc5180a210646db1622662a3d56cc405d3e0c346a?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/50b1ad2e498f523425ee0a8cc5180a210646db1622662a3d56cc405d3e0c346a?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/50b1ad2e498f523425ee0a8cc5180a210646db1622662a3d56cc405d3e0c346a?s=96&d=mm&r=g","caption":"admin"},"sameAs":["http:\/\/denvermovingchronicle.com"],"url":"https:\/\/denvermovingchronicle.com\/?author=1"}]}},"_links":{"self":[{"href":"https:\/\/denvermovingchronicle.com\/index.php?rest_route=\/wp\/v2\/posts\/3455","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/denvermovingchronicle.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/denvermovingchronicle.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/denvermovingchronicle.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/denvermovingchronicle.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3455"}],"version-history":[{"count":0,"href":"https:\/\/denvermovingchronicle.com\/index.php?rest_route=\/wp\/v2\/posts\/3455\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/denvermovingchronicle.com\/index.php?rest_route=\/wp\/v2\/media\/3454"}],"wp:attachment":[{"href":"https:\/\/denvermovingchronicle.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3455"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/denvermovingchronicle.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3455"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/denvermovingchronicle.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3455"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}