Raquel M.P.S. Melo

Larvicidal efficacy of nitenpyram on the treatment of myiasis caused by Cochliomyia hominivorax (Diptera: Calliphoridae) in dogs

The purpose of our study was to evaluate the larvicidal efficacy of nitenpyram for the treatment of screwworm myiasis caused by Cochliomyia hominivorax in naturally infested dogs. Seven Beagle dogs presenting with myiasis were treated with nitenpyram twice at an interval of 6 h. The animals received dosages between 1.43 and 4.42 mg/kg body weight of nitenpyram in each given treatment. The criteria used to determine the drug efficacy were larval expulsion and fall. These were quantified at 15 min intervals within the first hour followed by 2, 3, 4, 6, and 18 h post-treatment. The highest larval expulsion happened between 1 and 2 h post-treatment. The spontaneous larval expulsion percentages were 86% and 94.11% for 6 and 18 h after the first treatment, respectively. Larvae were expelled until 18 h post-treatment. After this period the remaining dead larvae were mechanically removed. Nitenpyram showed 100% efficacy on the treatment of myiasis by C. hominivorax in naturally infested dogs.

Survey on control and management practices of equine helminthes infection

Twenty-nine stud farms were selected in the Medium Paraiba region of the Rio de Janeiro state, Brazil. After an interview with the person responsible for the animals, faecal samples were collected from mares and analyzed via the EPG technique, faecal cultures, Sedimentation-centrifugo-flotation, and modified Ueno and Baermann techniques. The prevalence of helminths in the mares and in the stud farms was calculated. The stocking rates of pasture, change of horse bedding, absence of pasture rotation, absence of technology in the property, and less frequent treatment of the animals were associated with a greater prevalence of helminths, showing that these variables must be considered in equine control programs. The intensity of the parasitism was also associated with the stocking rate of pasture, absence of dunghill, presence of the animals only in paddocks, lack of technology in the property, less frequent treatment of the animals, and absence of the use of rotation regarding the anthelmintic class.

Atividade residual in vitro do pelo de cobertura de cães tratados com dinotefuran sobre larvas e adultos de Ctenocephalides felis felis (Bouché, 1835) (Siphonaptera: pulicidae)

The aim of this study was to evaluate the residual activity of treated dogs hair coat with dinotefuran on larvae and adults of Ctenocephalides felis felis. Three female Beagle dogs were used. One female dog was treated with 0.834% dinotefuran spray, the second was treated with 30% dinotefuran strip-on and the third was not treated. Some areas of dogs hair were clipped on days 2, 9, 16, 23, 30, 37 and 44 after treatment. For the evaluation of adulticidal and larvicidal activities, flea adults and larvae from the laboratory colony were used. Six repetitions were used with 10 samples of each flea stage per day, placed in assay tubes. In each repetition we added 0.02 g of treated or untreated dogs hair and larval diet for the immature stage. Flea adult assay was evaluated with 24 hours and the flea larvae 20 days after treatment. The residue on hair coat of both treated dogs showed efficacy on the flea larvae control for 44 days. Regarding the flea adults control the spray and strip-on formulations showed efficacy until days 16 and 23, respectively.

Furuncular myiasis caused by the human bot-fly Dermatobia hominis in a domestic cat from Brazil

This paper reports a case of furuncular myiasis caused by the human bot-fly Dermatobia hominis in a domestic cat from Brazil. A crossbred shorthaired female cat of approximately 3 years old, presented with three boil-like cutaneous lesions at the left cranioventral region of the neck. These were diagnosed as furuncular myiasis. The animal was sedated, and after shaving the fur, bot-fly larvae were removed from the lesion by digital compression. Afterwards, the wounds were treated with 10% iodine solution and also with wound-healing cream containing sulfanilamide, urea and beeswax. Maggots were identified as third-stage larvae of D hominis. Clinical case reports of human bot-fly myiasis in cats are relevant due to its scarce occurrence in feline veterinary practice in some countries.

Eficácia do diazinon em uma formulação de uso otológico no tratamento da sarna otodécica em cães

infestations in dogs. Ten naturally infested beagle dogs wereexamined by bilateral otoscopy three days before treatment and on the treatment day. The dogs wererandomly divided into two groups, which five were the control group and the other five treated. Onthe treated group 1 ml of the otic solution was applied in each ear for seven following days,corresponding to 10 mg of diazinon per ear everyday. All animals were examined by otoscopy ondays +1, +4, +10, +17 +24 e +31 after treatment. The control dogs showed mites during the wholeperiod of observation. On the treated group the otic solution had a 100% efficacy on each day ofobservation until day +31.