GEORGIS’ PARASITOLOGY FOR VETERINARIANS by DWIGHT D. BOWMAN MS PhD

Author:DWIGHT D. BOWMAN, MS, PhD [BOWMAN, DWIGHT D.]
Language: eng
Format: epub
ISBN: 978-1-4160-6918-8
Publisher: Saunders Elsevier
Published: 2009-06-12T16:00:00+00:00

Treatment and control

Trichuris infections in beef cattle can be treated with ivermectin, eprinomectin, or doramectin pour-on with 5 mg/10 kg body weight or with injectable doramectin with 0.2 mg/kg body weight. Ivermectin can be used as a drench in sheep for treatment of Trichuris ovis at 0.2 mg/kg body weight.

T. suis infections in swine are susceptible to dichlorvos (Atgard) fed in meal-type feed at 11.2 to 21.6 mg/kg body weight. T. suis infections are also susceptible to fenbendazole (9 mg/kg for 3 to 12 days).

Infective T. vulpis eggs survive in soil for a long time, and dogs kept in contact with contaminated soils tend to become reinfected after treatment. Lasting success in removing these parasites depends on separating the patient from these eggs. However, in the emphasis for the need for sanitation, an important possibility may be overlooked. Assuming that the developing parasitic larvae are more resistant to anthelmintic action than are the adult worms, it follows that patent infection is almost certain to recur through maturation of immature forms that have survived a dose of anthelmintic. Most common canine intestinal nematode parasites require only a few weeks to mature, so a second dose of anthelmintic administered 2 or 3 weeks after the first theoretically rids the host of the worms that were unaffected by the first treatment. T. vulpis differs from the others in requiring about 3 months to mature, so medication should be routinely repeated three times at monthly intervals to destroy the worms as they mature and prevent them from contaminating the environment.

In the United States, the preferred drugs for treatment of T. vulpis infection are fenbendazole (Panacur), milbemycin oxime (Interceptor or Sentinel), febantel (with praziquantel and pyrantel pamoate in Drontal Plus), and moxidectin (with imidacloprid in Advantage Multi). The rare case of Trichuris infection in the cat must be handled on an experimental basis because no drug has been cleared specifically for this purpose, although fenbendazole or febantel are probably suitable.

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