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Bulletin No. 19 - Fall 2004
Parasitology- No Category
VYT P, HEYLEN P, DE SMET K, PEELAERS I, VERCRUYSSE J
Sarcoptic mange elimination in swine herds: evaluation with different diagnostic tools
Proceedings of International Pig Veterinary Society 18th Congress, June 27-July 1, 2004, Hamburg, Germany, Volume 1, Page 276, Abstract No. 504
Sarcoptic mange is affecting the production efficiency of swine worldwide. However, the availability of highly effective treatments makes elimination of sarcoptic mange possible. The Belgian elimination program for swine mange started in 2001. Three elimination protocols were used: (a) a double treatment with ivermectin (6 farms) on day 1 and 14 (by injection for adult animals and piglets and, in case of fatteners with in feed treatment), (b) a single doramectin injection (12 farms) (3) and (c) a combination of both drugs (5 farms). Diagnosis of sarcoptic mange was done before and 7 months after treatment. Before elimination mites were found on 3 farms and after elimination no mites could be detected. From the 5 farms with positive Rubbing Index (>0.4) before elimination, one farm remained positive after treatment. There was a decrease of the mean RI. The number of farms with at least two serologically positive animals was 15 before treatment and decreased to 8 after 12 months. The standard eradication protocol with two treatments with ivermectin rarely results in failures. However, inexplicable failures have been observed after the one-shot-injection with doramectin in the Netherlands. In one farm this observation seems to be confirmed by a rise in serologically positive animals 1 year after treatment with doramectin. Infection couldn't be confirmed but further serology was positive. Since then, within the program, two administrations of doramectin are required. In conclusion we can say that even with the different diagnostic tools at hand, successful elimination of mange is hard to confirm. Strict control on treatment and biosecurity can prevent failure.
