Dogs pick them up in the soil or from an infected mother during nursing. Hookworms are parasites that attach with sharp teeth to the intestines of their animal host, feeding on its blood. * A task force of the American Association of Veterinary Parasitologists is working to increase awareness of the importance of screening for hookworms and testing for resistance after treatment. * Several parasitologists call it an overlooked, emerging threat. * Veterinarians in the United States are beginning to see in their dog patients what researchers first described in 2019: Some isolates of a common canine hookworm species are resistant to all the dewormers approved by the U.S. Food and Drug Administration for use in dogs. That’s the year researchers reported for the first time that some isolates of Ancylostoma caninum, the most common species of canine hookworm in the country, appear to be resistant to all three classes of dewormers, called anthelmintics, that are approved by the U.S. Feeman was witnessing a development that veterinary parasitologists have been warning about since 2019. In mid-March, the pup developed bloody diarrhea. All of them failed to knock out the hookworms. Over the next six weeks, the veterinarian alternated the two medications with a third. The doctor in Ohio prescribed standard dewormers, pyrantel and fenbendazole, in succession. What was unusual, in Feeman's experience, happened later. William Feeman for a wellness appointment in January appeared healthy but tested positive for hookworms - not uncommon during a routine puppy exam. Parasitologists urge veterinarians to ramp up screening, testing after treatment Drug-resistant hookworms spreading in dogs
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