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  • Title: Efficacy of dichlorvos administered orally in single and repeated doses for removal of canine whipworms.
    Author: Olsen JL, Rollins LD, Rosenberg MC, Gundlach CE.
    Journal: J Am Vet Med Assoc; 1977 Sep 15; 171(6):542-4. PubMed ID: 562334.
    Abstract:
    A single dose of dichlorvos (2,2-dichlorovinyl dimethyl phosphate) was administered orally at a dosage of 30 mg/kg to 19 dogs naturally infected with Trichuris vulpis and to 13 dogs experimentally infected with T vulpis. Based on the presence or absence of whipworm eggs in the feces, 10 to 14 days after treatment, dogs were either killed and the number of remaining worms counted, or the dogs were given a 2nd treatment. After the initial treatment, 18 dogs had a mean of 0.5 worms (SD +/- 0.5) remaining, and 14 dogs had a mean of 55 worms (SD +/- 85) remaining. After these 14 dogs were given a 2nd treatment, the number of womrs remaining decreased to a mean of 14 (SD +/- 28). Although a high degree of efficacy was attained in 56% of the dogs after the 1st dose, the data suggested that additional treatment may often be necessary.
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