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- W2002802632 abstract "Melarsomine dihydrochloride (RM 340), a drug being developed as an adulticide for treatment of heartworm (Dirofilaria immitis) infection in dogs, was safe and highly effective as a clinical prophylactic agent against naturally acquired infections using Strategic and Tactical Treatment Programs. The Strategic Program involved treatment every 4 months (three series of treatments per year), disregarding the mosquito season (MS), to clear the existing infection at each treatment. The Tactical Program consisted of two series of treatments per year, 4 months apart, with the first one given about the middle of the MS (August) and the second one given after the end of the MS (December). Melarsomine was administered as two i.m. injections (lumbar muscles) of 2.2 mg kg-1 given 3 h apart. A total of 90 heartworm-naive beagles and a number of microfilaremic 'seed' dogs were used. Three similar experiments (30 beagles per experiment) were conducted at selected areas (Georgia, Florida, Louisiana) known to be enzootic for heartworm. At each site, 30 beagles were allocated to six groups of five dogs each, and four of these groups were placed outdoors in April of 1988. Two groups (control and treated) were exposed for 12 months, and the treated group was given melarsomine at 4, 8, and 12 months after exposure was started (Strategic Program). Another group was exposed for 8 months and treated with melarsomine at 4 and 8 months (Tactical Program). One group of tracer (sentinel) beagles was exposed from April to August 1988, one group from August to December 1988, and another from December 1988 to April 1989. April-August and August-December tracers served as controls for the tactically treated dogs. After exposure, all dogs were held indoors for 5 months before necropsy. Blood was collected at 4-5 month intervals and examined for microfilariae (MF) and adult heartworm antigen (enzyme-linked immunosorbent assay, ELISA). Treatment by the Strategic Program was 99% effective, with only one of the total of 15 treated dogs harboring any worms (a single female) at necropsy. Thirteen of the 14 control dogs (93%) exposed for 12 months became infected, with average worm recoveries of 6.8, 5.4, and 25.2 (range 1-45) for the Georgia, Florida, and Louisiana sites, respectively. All of the 13 heartworm-infected control dogs were antigen-positive, and 12 of these were also MF-positive, while none of the strategically treated dogs was either antigen- or MF-positive at necropsy. Tactical treatment of the total of 14 dogs twice per year was 100% effective.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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- W2002802632 date "1994-11-01" @default.
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- W2002802632 title "Clinical prophylactic activity of melarsomine dihydrochloride (RM 340) against Dirofilaria immitis in heartworm-naive beagles exposed to natural infection in three southeastern states" @default.
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- W2002802632 doi "https://doi.org/10.1016/0304-4017(93)00642-c" @default.
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