Martin Visser

Parasitic infections of domestic cats, Felis catus, in western Hungary.

During 2011, faeces from 235 owned domestic cats from a rural area in western Hungary were examined using standard coproscopical techniques. The overall prevalence of cats with endoparasites was 39.6% (95% CI 33.3-46.1). The most frequently identified faecal forms were those of ascarids (Toxocara, 17.4%; Toxascaris 7.2%), followed by those of Aelurostrongylus lungworms (14.5%), hookworms (11.1%), taeniid cestodes (4.7%), Cystoisospora coccidians (4.3%), and capillarids (3.8%). Single and multiple infections with up to five parasites concurrently were founded in 24.7% and 14.9% of the cats, respectively. Mixed endoparasite infections were recorded more frequently (p=0.0245) in cats greater than one year old compared to younger cats. Young cats (≤ 1 year) were parasitized more frequently (p<0.05) with ascarids and Cystoisospora spp. but demonstrated infections of hookworms, lungworms and taeniid cestodes less often than the older cats. Cats with taeniid infection were more likely (p<0.05) to harbour Toxocara, hookworm, Aelurostrongylus, and capillarid infections than cats without taeniid cestodes. Cats of owners who claimed the use of wormers were less frequently helminth-positive compared to cats whose owners did not use anthelmintics (21.2% vs. 44.4%; p=0.001). A subset of 115 faecal samples screened by a coproantigen ELISA revealed Giardia-specific antigen in 37.4% samples. Giardia cysts were found by immunofluorescent staining in 30 of the 43 samples tested positive for Giardia by ELISA. In addition, ectoparasites collected from 82 cats by body search and combing were identified. Fleas (1-30 per cat), biting lice (Felicola subrostratus), and ticks (1-5 per cat) were isolated from 58, 1 and 43 cats, respectively. Ctenocephalides felis was identified on all flea infested cats while single specimens of C. canis and Pulex irritans were recovered from three and two cats, respectively. All but one tick collected were adult Ixodes ricinus; the single other tick was a nymph of I. canisuga. By providing basic data on the epidemiology of parasitic infections, the results of this survey should emphasize the need of attending to parasites of cats from the veterinary point of view with respect to both appropriate diagnostics and control.

Re-evaluation of ivermectin efficacy against equine gastrointestinal parasites

Two trials were conducted to confirm the efficacy of ivermectin paste against endoparasites of horses. In these trials, 20 ponies were treated with ivermectin oral paste at 200 mcg x kg body weight once on Day 0, and 20 ponies served as unmedicated controls. The animals carried naturally acquired parasite infections as confirmed by pretrial fecal examination. The animals were necropsied for worm recovery on Days 14, 15 or 16. Parasites recovered were identified to species. Horses treated with ivermectin had significantly (P<0.05) fewer (>99.0% reduction) adult small strongyles (Coronocyclus spp including C. coronatus, C. labiatus, C. labratus; Cyathostomum spp including C. catinatum, C. pateratum; Cylicocyclus spp including C. ashworthi, C. elongatus, C. insigne, C. leptostomum, C. nassatus, C. radiatus; Cylicodontophorus bicoronatus; Cylicostephanus spp including C. asymetricus, C. bidentatus, C. calicatus, C. goldi, C. longibursatus, C. minutus; Gyalocephalus capitatus; Parapoteriostomum spp including P. euproctus, P. mettami; Petrovinema poculatum; Poteriostomum spp including P. imparidentatum, P. ratzii) and adult large strongyles (Strongylus edentatus, S. vulgaris; Triodontophorus spp including T. brevicauda, T. serratus; Craterostomum acuticaudatum) than the controls. Ivermectin was also highly effective (94% to >99%, P<0.05-0.01) against Gasterophilus intestinalis larvae, Habronema spp., Oxyuris equi, Parascaris equorum. The data from these two trials confirm that ivermectin paste administered to horses orally at 200mcg x kg(-1) continues to be highly effective for treatment and control of a broad range of small and large strongyle species as well as other species of gastrointestinal parasites.

Endoparasites of cats from the Tirana area and the first report on Aelurostrongylus abstrusus (Railliet, 1898) in Albania

ZusammenfassungIm Kot von Katzen aus dem Großraum Tirana wurden Larven nachgewiesen, die für eine Infektion mit dem Lungenwurm Aelurostrongylus abstrusus sprachen. Dieser Befund konnte durch die Sektion von 18 Katzen bestätigt werden, von denen 9 einen Befall der Lungen mit adulten A. abstrusus (Railliet, 1898) (Prävalenz 50 %; 1–11 Würmer) aufwiesen. Neben A. abstrusus wurden Eucoleus aerophilus (16,7 %; 1–9 Würmer) aus der Lunge sowie Toxocara cati (83,3 %; 2–33 Würmer), Ancylostoma tubaeforme (44,4 %; 1–20 Würmer), Dipylidium caninum (83,3 %; 1–164 Würmer), Joyeuxiella pasqualei (11,1 %; 1–3 Würmer) und ein Kratzer (Acanthozephala) aus dem Magen–Darm–Trakt der Katzen isoliert. Im Rektumkot waren Oozysten von Cystoisospora felis und C. rivolta bei 5,6 % bzw. 11,1 % der sezierten Katzen nachweisbar. Die vorläufigen Ergebnis sprechen für eine hohe Prävalenz an Endoparasiten in den freilebenden Katzen aus Tirana. Das Vorkommen von A. abstrusus, dessen Befall mit respiratorischen Symptomen einhergehen kann, wird hiermit erstmalig in Albanien beschrieben.SummaryFollowing the recovery of first–stage nematode larvae indicative of Aelurostrongylus abstrusus infection in the faeces of free-roaming cats from the greater Tirana area, examination of 18 cats at necropsy revealed nine of them harbouring adult A. abstrusus (Railliet, 1898) in the lungs (prevalence, 50%; range, 1–11). In addition to A. abstrusus, Eucoleus aerophilus (16.7%; 1–9) was isolated from the lungs, and Toxocara cati (83.3%; 2–33), Ancylostoma tubaeforme (44.4%; 1–20), Dipylidium caninum (83.3%; 1–164), Joyeuxiella pasqualei (11.1%; 1–3) and one specimen of an acanthocephalan (5.5%) were recovered from the gastrointestinal tract. Furthermore, oocysts of Cystoisospora felis and C. rivolta were found in the rectal faeces of 5.6% and 11.1% of the cats, respectively. In conclusion, the prevalence of endoparasite infection in free–roaming cats in Tirana can be considered to be high. The occurrence of A. abstrusus, which may cause respiratory distress in cats, is reported for the first time in Albania.

Detection of Babesia canis subspecies and other arthropod-borne diseases in dogs from Tirana, Albania

ZusammenfassungDurch Arthropoden übertragene Infektionen haben in der jüngeren Vergangenheit zunehmend an Bedeutung gewonnen, auch bedingt durch vermehrte Reisen in, beziehungsweise Importe von Hunden aus Regionen, in denen die Erreger endemisch sind. Während die epidemiologische Situation im westlichen Mittelmeerraum gut dokumentiert ist, sind aus Osteuropa und dem Balkan vergleichsweise wenige Informationen verfügbar. In der vorliegenden Studie wurden Blutproben von 30 klinisch unauffälligen Hunden aus den Randgebieten von Tirana, Albanien, auf vektor-übertragene Infektionen untersucht. Mittels direkter und/oder indirekter Verfahren wurden die Blutproben auf Babesia canis, Hepatozoon spp., Leishmania spp., Dirofilaria spp., Ehrlichia canis, Anaplasma phagocytophilum, Bartonella spp. und Rickettsia spp. untersucht. Im Blut von 20 Hunden (= 67 %) wurden Antikörper bzw. Erreger durch Arthropoden übertragene Infektionen nachgewiesen. Antikörper gegen B. canis, E. canis und/oder A. phagocytophilum waren im Serum von 19 Hunden (= 63 %) nachweisbar. Bei 13 Hunden (= 43 %) erfolgte ein Erregernachweis mittels Blutausstrich, PCR oder ELISA, wobei B. caniscanis, B. canis vogeli, Hepatozoon spp., D. immitis und/oder E. canis identifiziert wurden. Infektionen mit Leishmania spp., Bartonella spp. und Rickettsia spp. waren nicht nachweisbar.SummarySummary. The importance of arthropod-borne diseases increased in the recent past in particular due to frequent travel with dogs in or by importing of dogs from regions with endemic occurrence of these diseases. While the epidemiological situation is well known for the western parts of the Mediterranean, only limited data is available for Eastern Europe and the Balkans. Thirty clinically healthy dogs from suburban areas of Tirana, Albania, were tested for Babesia canis, Hepatozoon spp., Leishmania spp., Dirofilaria spp., Ehrlichia canis, Anaplasma phagocytophilum, Bartonella spp. and Rickettsia spp. using direct and indirect methods. Antibodies against and/or pathogens of arthropod-borne diseases were detected in the blood of 20 (67%) dogs. Nineteen dogs (63%) had antibodies against B. canis, E. canis and/or A. phagocytophilum.Babesia c. canis, Babesia c. vogeli, Hepatozoon spp., D. immitis and/or E. canis were identified by blood smear, PCR or ELISA in 13 (43%) dogs. There was no evidence for Leishmania spp., Bartonella spp. and Rickettsia spp. infections.

Effects of Psoroptes ovis infection and its control with an ivermectin controlled-release capsule on growing sheep: 1. Evaluation of weight gain, feed consumption and carcass value

To evaluate the prophylactic and therapeutic effects of an ivermectin controlled-release capsule (IVM-CRC) on the productivity of growing sheep infested with Psoroptes ovis 24 male and 24 female Merino landrace lambs, 5-6 months old and weighing 21.2-35.0 kg, were used. Sixteen replicates of three animals were formed based on sex and Day 0 body weight. Within each replicate animals were randomly allocated to one of three groups: untreated control; IVM-CRC on Day 0; IVM-CRC on Day 84. For treatment an IVM-CRC for sheep weighing 20-45 kg was used which is designed to deliver ivermectin at a minimum dose of 20 microg/kg per day for 100 days. The lambs were infested with 50-60 P. ovis mites each on Days 14 and 21. Mites in skin scrapings were counted on Days 70, 84, 98, 112 and 126. Body weight and feed consumption were measured every 2 weeks from Day 0 to 126. The animals were slaughtered on Day 127 and their carcasses evaluated. The IVM-CRC treatment on Day 0 prevented the establishment of P. ovis. All untreated lambs became infested. The lambs treated with an IVM-CRC on Day 84 became mite-free from Day 112 onwards. The lambs treated on Day 0 had significantly (p<0.05) greater body weight gain from Day 0 to 84 (13.9 kg) and Day 0 to 126 (20.9 kg) than the untreated controls (9.6 and 12.8 kg, respectively) and the sheep treated on Day 84 (8.4 and 14.9 kg, respectively). Feed consumption (Days 0-126) for sheep treated with the IVM-CRC on Day 0 was higher than for sheep treated on Day 84 (p<0.05) and for the untreated controls (p<0.1). The carcasses of sheep treated with the IVM-CRC on Day 0 had significantly (p<0.05) higher warm and cold weights, carcass yield, rib eye area and back fat thickness than the untreated control group and the sheep treated with the IVM-CRC on Day 84. The sheep treated with the ivermectin CRC on either Day 0 or 84 had significantly (p<0.05) better muscle scores and lower muscle pH 1h post-slaughter than the untreated controls. There was no significant (p>0.1) difference between warm and cold carcass weights, carcass yield and rib eye area between sheep treated on Day 84 and untreated controls.

Efficacy of a combination ivermectin/praziquantel paste against nematodes, cestodes and bots in naturally infected ponies

EQUIDS are susceptible to infection with a variety of internal parasites. These infections are known to cause problems ranging from reduced performance and condition to abdominal disease (such as colic or severe diarrhoea). The most common parasites of equids are the small (Cyathostominae) and large (Strongylinae) strongyles, the ascarid Parascaris equorum, the pinworm Oxyuris equi, tapeworms (Anoplocephalidae) and gasterophilid bots (Gasterophilus species). These parasites coexist in equids and occur worldwide, with the highest prevalence of infection in animals kept outdoors. Broad-spectrum anthelmintics with activity against nematodes, cestodes and arthropods are of interest for use in animals with access to pasture. However, as the epidemiology of the three groups of parasites is different, such products should be used strategically as part of a control programme and not continuously. To control multispecies parasitic infections in equids, an ivermectin/praziquantel paste formulation (0·2 mg ivermectin/kg plus 1·0 mg praziquantel/kg bodyweight) has been developed, based on an ivermectin oral paste (Eqvalan or Zimecterin; Merial). Pilot, dose determination, dose confirmation, non-interference and field efficacy studies have demonstrated the combination product to be highly effective against gastrointestinal nematodes, bots and the most prevalent and potentially most pathogenic tapeworm, Anoplocephala perfoliata (Rehbein and others 2003, Marley and others 2004). This short communication describes a study to evaluate the efficacy of the combination ivermectin/praziquantel combination paste in equids naturally infected with common gastrointestinal parasites and additional species of tapeworm. The study complied with the International Cooperation on Harmonisation of Technical Requirements for Registration of Veterinary Medicinal Products Guideline on Good Clinical Practice. Animals were handled in compliance with Merial’s animal care, use and welfare procedures and all applicable animal welfare regulations in the UK, where the study was performed. Thirty New Forest ponies, approximately 1·5 years of age and weighing 125 to 239 kg, were sourced from an area of the New Forest where animals known to be infected with a range of gastrointestinal parasites, including tapeworms, had grazed. This had been confirmed by examination of the gastro intestinal tracts of ponies at a local horse abattoir. Faecal samples were collected from the rectum of individual animals seven, five and one day before treatment, and seven or eight days after treatment, when the animals were examined postmortem. The faecal samples collected before the treatment were examined for cestode eggs using a modified Wisconsin egg count technique (double centrifugation/ sucrose flotation technique using 15 g of faeces; sensitivity one egg per 15 g) (Cox and Todd 1962). Nematode eggs were counted in faecal samples collected on the day before treatment and at postmortem examination using a modified McMaster technique with a sensitivity level of 10 eggs per gram (epg) (MAFF 1986). Ponies were paired together to form 15 replicates, based on decreasing bodyweights measured on the day before treatment. Within each replicate, one animal was randomly allocated to be sham-dosed (empty syringe, non-medicated), and the other was allocated to receive oral treatment with the paste, containing 1·55 per cent ivermectin plus 7·55 per cent praziquantel (0·2 mg ivermectin plus 1·0 mg praziquantel/kg bodyweight). The ponies were housed in two pens with replicates housed together, and were provided with grass silage and fresh water ad libitum. The treatments were administered orally once on day 0. Each animal underwent physical examination before treatment, and the animals were observed approximately hourly for the first four hours after dosing and daily thereafter. Seven or eight days after treatment, the animals in each replicate were humanely euthanased. At postmortem examination, the liver, stomach and small and large intestines were removed. The contents of each stomach and small intestine were individually collected and preserved. The opened stomach was soaked in saline solution at approximately 37°C overnight and the resulting fluid was collected and preserved. The caecum and ventral and dorsal colon were opened, and the total fresh contents, as well as the organ mucosa, were carefully examined for cestodes. The livers were sliced into 1 cm pieces, and any parasites were removed. The entire small intestinal content was preserved and examined for parasites. For both the stomach content and stomach digest, the whole of the material was examined for large parasites, that is, large nematodes and bot larvae. In addition, 20 per cent of each stomach material was examined for other parasites. All the parasites recovered were counted and identified. The efficacy of the treatment against strongyles was measured in terms of faecal egg count reduction, and efficacy against the other parasites was measured on the basis of the parasite counts at postmortem examination. The faecal egg and parasite counts were transformed to the natural logarithm of (count +1) for analysis and calculation of geometric means. Treatment groups were compared using the Wilcoxon rank sum test. A two-sided test was used at α=0·05. Efficacy was calculated for each parasite species as 100 x (control group geometric mean – treated group geometric mean/control group geometric mean). The paste was well tolerated by all the treated ponies, and no health problems were noted during the study. Before the treatment, all the ponies passed strongylid eggs in their faeces and Parascaris species eggs were passed by seven ponies: no cestode eggs were detected in the faeces of any of the animals in the pretreatment examination. Treatment with the combination paste reduced the strongylid and ascarid egg counts to zero (Table 1). At postmortem examination, Trichostrongylus axei and larvae of Gasterophilus intestinalis were recovered from the stomach, P equorum (adults and fifth-stage larvae), Anoplocephala magna, Paranoplocephala mamillana (syn Anoplocephaloides mamillana) and larvae of Gasterophilus nasalis from the small intestine, and A perfoliata from the large intestine. Based on the small size (short strobila) and lack of gravid proglottids, all the tapeworms were considered to be non-reproducing (immature) adults. Table 2 summaries the parasite counts and the calculated efficacy of the combination paste treatment, derived by comparing the postmortem parasite burdens of the controls and the treated ponies. Ponies treated with the combination paste had significantly (P<0·05) fewer of the following parasites: T axei, P equorum, A magna, P mamillana, G intestinalis (secondand third-stage larvae) and G nasalis (second-stage larVeterinary Record (2007) 161, 722-724

Effects of Psoroptes ovis infection and its control with an ivermectin controlled-release capsule on growing sheep. 2. Evaluation of wool production and leather value.

To evaluate the prophylactic and therapeutic effects of an ivermectin controlled-release capsule (IVM-CRC) on the productivity of growing sheep infested with Psoroptes ovis 24 male and 24 female Merino landrace lambs, 5-6 months old and weighing 21.2-35.0 kg, were used. Sixteen replicates of three animals were formed based on sex and Day 0 body weight. Within each replicate animals were randomly allocated to one of three groups: untreated control; IVM-CRC on Day 0; IVM-CRC on Day 84. For treatment an IVM-CRC for sheep weighing 20-45 kg was used which is designed to deliver ivermectin at a minimum dose of 20 microg/kg/day for 100 days. The lambs were infested with 50-60 P. ovis mites each on days 14 and 21. The animals were shorn on Day 126. After slaughter on Day 127 the quality of the leather produced from their skins was evaluated. The IVM-CRC treatment on Day 0 prevented the establishment of P. ovis. All untreated lambs became infested. The lambs treated with an IVM-CRC on Day 84 became mite-free from Day 112 onwards. The lambs which were treated on Day 0 had significantly (p<0.05) greater clean fleece weight (1.5 kg) and fleece yield (52.1%) than the untreated controls (0.9 kg and 34.1%, respectively) or than lambs treated on Day 84 (1.0 kg and 47.8%, respectively). Clean fleece weight and fleece yield were in the tendency (p=0.055) or significantly (p<0. 001) greater, respectively, for lambs treated on Day 84 than for the untreated controls. The chrome tanned dried crust leather of all untreated controls and six of the 16 lambs treated on Day 84 showed grain surface defects such as discolourations, indurations and coarse, pitted grain. The useful (defect-free) leather size was significantly (p<0.01) higher for the lambs treated on Day 0 (100%) than for the lambs treated on Day 84 (82.7%) and the untreated controls (7.8%). The physical testing revealed that the leather of sheep treated on Day 0 had significantly (p<0.05) higher thickness, elongation break and tear resistance than the leather of both untreated controls and sheep treated on Day 84. There were no significant differences in the physical characteristics of the leather of the untreated controls and the sheep treated on Day 84.

Efficacy of afoxolaner plus milbemycin oxime chewable tablets against naturally acquired intestinal nematodes in dogs

The efficacy of oral afoxolaner plus milbemycin oxime combination chewable tablets (NexGard Spectra, Merial) against naturally acquired intestinal nematode infections in dogs was evaluated in six negative control, blinded studies including a total of 114 dogs. Dogs were selected based on a pre-treatment fecal examination indicating patent infections with hookworms (two studies), Toxocara or Toxascaris ascarids (one study each) or Trichuris whipworms (two studies). In each study, dogs were assigned to blocks of two animals each, based on decreasing pre-treatment body weight and were randomly allocated to one of two groups consisting of eight, nine or 10 dogs: untreated (control) or treated with the combination chewable tablet formulation. Chewable tablets were combined to provide doses of actives as close as possible to the minimum effective dose of afoxolaner and milbemycin oxime, i.e., 2.5 mg/kg body weight and 0.5 mg/kg body weight, respectively, once on Day 0. For parasite recovery and count, dogs were euthanized humanely and necropsied seven or eight days after treatment. A single treatment with afoxolaner plus milbemycin oxime chewable tablets provided 94.8% and 90.9% efficacy against adult Ancylostoma braziliense and A. caninum, respectively, 97.8% and 99.4% efficacy against adult Toxocara canis and Toxascaris leonina, respectively, and ≥98.3% efficacy against adult Trichuris vulpis. Compared to untreated controls, nematode counts of the treated dogs were significantly reduced (F-test; p<0.002). In addition, analysis of the pooled data across studies revealed that treatment with afoxolaner plus milbemycin oxime chewable tablets reduced adult Uncinaria stenocephala burdens by 74.9% (p=0.002). All dogs tolerated the treatment well based on clinical observations post-treatment and daily clinical observations. No adverse experiences or other clinical problems related to the treatment were observed throughout the studies. The results of this series of controlled studies demonstrated high efficacy and excellent acceptability and safety of the afoxolaner plus milbemycin oxime chewable tablets when administered for treatment of a broad range of canine intestinal nematode infections.

Efficacy of a novel topical combination of fipronil, (S)-methoprene, eprinomectin, and praziquantel, against the ticks, Ixodes ricinus and Ixodes scapularis, on cats.

Five controlled, blinded and randomized studies were conducted to examine the efficacy of a single topical application of a combination of fipronil, (S)-methoprene, eprinomectin, and praziquantel (BROADLINE(®), Merial) against induced infestations with Ixodes ticks on cats. Three studies investigated the efficacy against Ixodes ricinus and two against Ixodes scapularis. In each study, purpose-bred cats were assigned at random to an untreated group or to a treated group. For the studies using I. ricinus, cats were infested with 50 female ticks and a similar number of males 2 days before treatment application, and weekly afterwards on between four and six occasions. For the studies using I. scapularis, cats were infested with a total of 50 ticks (approximately 25 females and 25 males) according to the same schedule as for I. ricinus. Tick counts for the evaluation of efficacy were performed 48 h after treatment and 48 h after the subsequent weekly infestations. Weekly attachment rates to untreated cats of at least 29% for I. ricinus and at least 30% for I. scapularis demonstrated consistently that the ticks were vigorous and that the attachment rates were adequate for efficacy evaluation. In the I. ricinus studies, an efficacy of at least 93% was demonstrated for up to 37 days after the treatment. In the I. scapularis studies, the efficacy level was at least 95% 30 days after the treatment. The product was well tolerated and caused no adverse reaction.

Efficacy of a novel topical fipronil, (S)-methoprene, eprinomectin and praziquantel combination against naturally acquired intestinal nematode and cestode infections in cats.

The efficacy of a novel topical combination formulation of fipronil, (S)-methoprene, eprinomectin and praziquantel against naturally acquired intestinal nematode and cestode infections in cats was evaluated in seven negative control, blinded studies. Cats were selected based on a pre-treatment faecal examination indicating a patent infection with at least hookworms (two studies), Toxocara ascarids (one study), taeniid cestodes (two studies) or Dipylidium cestodes (two studies). In each study, cats were assigned randomly to blocks of two animals each, based on decreasing pre-treatment body weight and were randomly allocated to one of two groups of six to 12 cats: untreated (control) or treated with topical fipronil (8.3%, w/v), (S)-methoprene (10%, w/v), eprinomectin (0.4%, w/v) and praziquantel (8.3%, w/v) (BROADLINE(®), Merial) at 0.12 mL/kg body weight (providing a minimum of 10mg fipronil+12 mg S-methoprene+0.5mg eprinomectin+10mg praziquantel per kg body weight). The topical treatment was administered directly on the skin in the midline of the neck in a single spot once on Day 0. For parasite recovery and count, cats were euthanized humanely and necropsied seven or ten days after treatment. A single treatment with the novel topical combination product provided 91% efficacy against Ancylostoma braziliense, ≥ 99% efficacy against Ancylostoma tubaeforme, and >97% efficacy against Toxocara cati. Similarly, excellent efficacy was established against Taenia taeniaeformis, Dipylidium caninum and Diplopylidium spp. as demonstrated by >97% and up to 100% reductions of cestode counts in the treated cats when compared to the untreated controls (P<0.01). All cats accepted the treatment well based on health observations post-treatment and daily health observations. No adverse experiences or other health problems were observed throughout the studies. The results of this series of controlled studies demonstrated high efficacy and excellent acceptability of the novel topical combination formulation of fipronil, (S)-methoprene, eprinomectin and praziquantel against a broad range of feline intestinal nematode and cestode infections.