Ivermectin Could be Ineffective Against Some Pinworms

Ivermectin is a currently used treatment against cyathostomins (small strongyles) and other life-threatening parasites. But it was ineffective in treating a herd of Welsh ponies against Oxyuris equi (pinworms) at a French research center over the course of three years.
Fenbendazole, however, eliminated the worms, which can cause anal itching and tail-rubbing, said Guillaume Sallé, DVM, PhD, of the French National Agricultural Institute (INRA), in Nouzilly, France.
“The targeted treatment strategy that’s generally recommended (with ivermectin) aims to control strongyles, against which the drug fenbendazole is no longer effective,” said Sallé. “However, fenbendazole is still every effective against ascarids (roundworms) and Oxyures (pinworms). It’s possible that by reducing the treatment load, we’re favoring a greater prevalence of Oxyures
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