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Efficacy of selamectin was studied in naturally acquired S. muris infections in rats. Fourty-eight 5. muris-positive rats were divided into six treated and two control groups. Selamectin (6 mg/kg) was applied topically to the skin in a single spot at the base of the neck in the treatment group. The rats of treated and control groups were necropsied on the 24th day after the treatment. Topical selamectin was found to be 40.7-63.3% effective (based on egg per gram method) in eliminating S. muris infection in rats. The efficacy of the treatment against S. muris (based on adult worm counts) in male and female rats was 35.14-58.88%, respectively (mean 48.39%).
Lemuricola (Madoxyuris) vauceli Chabaud, Brygoo et Petter, 1965 is redescribed on the basis of a re-examination of type and voucher specimens. Using both light and SEM microscopy, structures such as the cephalic papillae, details of the lateral alae, area rugosa and tail cuticular ornamentation, are described or redescribed with more precision. The detailed measurements of several male and female specimens are given in a table. In the original description, using light microscopy only, the authors had described 3 pairs of pedunculated papillae in the male of L. vauceli. The present study establishes the precise number, shape and disposition of the end of the male tail to include only two pairs of pedunculated papillae, 2 pairs of sessile papillae, and 1 pair of phasmids. As the same pattern was observed in all descriptions and recent redescriptions of species classified in the Enterobiinae, the present work confirms that the number and disposition of the caudal papillae observed in the subfamily is constant.
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Helminth parasites of laboratory mice and rats

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Rodents, as mice and rats are the most common laboratory animals used in research and testing. They are seldom investigated for autochthonous ecto- and endoparasites prior their utilization in the experiments. Helminth parasites can alter the interpretation of final results. Pinworms commonly infecting laboratory rodents include mainly the mice pinworms Syphacia obvelata and Aspiculuris tetraptera, and in rats Syphacia muris. The fact that many laboratory rodent colonies were found to be parasite contaminated suggests a need for eradication and improvment of the quality of laboratory rodents. This review reports the data on the presence of helminth parasites in laboratory rodents colonies, and suggests to pay special attention on controlling the sanitary conditions of animal houses.
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