Preliminary findings on the efficacy of selamectin in the treatment of dogs naturally infected with <i>Dirofilaria repens</i>
2010
Jacsó, Olga | Fok, Éva | Kiss, Gabriella | Kökény, Gábor | Lang, Zsolt
Subcutaneous dirofilariosis caused by <i>Dirofilaria repens</i> is common in dogs and it is an emerging helminthozoonosis in Europe, Asia, Africa and also in Hungary. Macrocyclic lactones are used for preventing the infection; however, their activity against the microfilariae and mature stages of this species is questionable. Selamectin is widely used for the prophylaxis of heartworm (<i>D. immitis</i>) infection. The objective of the present study was to test the microfilaricidal efficacy of the topical formulation of selamectin in dogs naturally infected with <i>D. repens</i> . A total of 78 Beagle dogs were examined for the presence of circulating microfilariae by Knott’s test. Twenty-three of the microfilaraemic dogs were divided into four groups and included in the trial. The dogs received monthly or biweekly selamectin treatment and were subjected to monthly blood testing for a period of 252 or 336 days. At the end of the study, 65% of the dogs were not microfilaraemic and the rest had low number of microfilariae in their blood. These results indicate that chronic spot-on selamectin treatment may be a useful tool also in the control of canine subcutaneous dirofilariosis.
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