Publications by authors named "Dirceu Guilherme de Souza Ramos"

Studies on Brazil's helminthological fauna began in the early 20th century, and since then several zoologists from different parts of the country have focused on parasitology. Recent studies have advanced our understanding of helminthological biodiversity in the Amazon region, especially in fish, which is essential for the Amazonian economy. This study aimed to inventory the platyhelminth fauna Cuniculus paca (paca).

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The yellow-footed tortoise (Chelonoidis denticulatus, Linnaeus, 1766) is among the most consumed chelonian species in the Amazon region, raising concerns about its conservation status. Furthermore, few studies have been carried out on the parameters of physiological normality of this species in free-living conditions, making it difficult to assess the impact of environmental changes on the physiology of the group. The erythrocyte osmotic fragility (EOF) test is a biomarker of environmental changes that cause membrane damage, decreasing erythrocyte resistance to osmotic stress.

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This is the first reported case of Bertiella mucronata infection in a black-and-gold howler monkey (Alouatta caraya) in Brazil. The present study confirms the widespread of B. mucronata in South America and suggest that black-and-gold howler monkeys may serve as viable reservoirs for B.

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Chelonoidis carbonarius is host to a great diversity of endoparasites. This research aimed to identify and taxonomically classify the parasitic forms of endoparasites found in the feces of C. carbonarius using coproparasitological methods.

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Article Synopsis
  • * Monitoring included heart rate, blood pressure, and other vital signs, assessing their pain response during and after surgery.
  • * Results showed that while epidural morphine did not eliminate intraoperative pain relief needs, it significantly lowered the amount of postoperative analgesia required in the cats receiving it.
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The acaricidal potential of various essential oils (EOs) has been evaluated based on their benefits in tick control. This study aimed to investigate the tick-killing activity of Pogostemon cablin "patchouli," Cymbopogon martinii "palmarosa," and Cymbopogon flexuosus "lemongrass" EOs on Rhipicephalus linnaei. Engorged females were collected from domiciled and non-domiciled dogs from Jataí city, Goiás state, to obtain larvae and nymphs in a controlled environment.

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Environmental changes in the Brazilian Pantanal and Cerrado facilitate the spread of parasitic diseases in wildlife, with significant implications for public health owing to their zoonotic potential. This study aimed to examine the occurrence and diversity of gastrointestinal parasites in wild felids within these regions to assess their ecological and health impacts. We collected and analyzed helminth-positive samples from 27 wild felids using specific taxonomic keys.

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  • * A study conducted in northern Mato Grosso, Brazil, collected data from 697 sheep over two years, finding that 45.77% were infested with O. ovis larvae, which occurred consistently throughout the year regardless of seasonal changes.
  • * Although seasonal prevalence showed slight variations (41% in spring to 56% in summer), factors like humidity and temperature did not indicate a significant impact on the infestation rates, suggesting that environmental conditions allow for year-round survival of the larvae
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  • - Ticks were collected from 102 wild animals in Mato Grosso and Goiás, Brazil, between 2015 and 2018, yielding a total of 2,338 ticks across four genera and at least 21 species.
  • - A molecular survey on 650 of the ticks identified various Rickettsial species, including Rickettsia amblyommatis and Rickettsia parkeri, linked to specific tick species.
  • - This research enhances the understanding of tick parasitism in wild animals and provides valuable insights into the epidemiology of tick-borne diseases in Brazil's Center-West region.
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Gastrointestinal diseases caused by parasites are frequently diagnosed in the clinical routine of domestic animals, especially dogs and cats. In general, they trigger factors that can affect human health due to zoonoses. Therefore, this study aims to identify the main intestinal parasites obtained from the fecal samples of dogs and cats in the municipality of Jata, Brazil, and their associated risk factors.

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Canine monocytic ehrlichiosis (CME) is endemic to Brazil, and studies have verified that dogs have been exposed to different genotypes of . This genetic divergence can influence the clinical response of the animals. We aimed to describe clinical and hematological changes in 125 dogs that reacted to BrTRP36, USTRP36, and CRTRP36 genotypes through enzyme immunoassays and to highlight the current concern regarding infection by the Costa Rican genotype.

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Increased interaction between wild and urban environments owing to human population growth, increased anthropization of biomes, and habitat loss for wild animals increases the spread of infectious and parasitic agents. The present study reports on the occurrence of gastrointestinal parasites in carnivorous mammals at two conservation institutions in the state of Goiás, Brazil. Fecal samples from 39 adult carnivores were collected after spontaneous defecation and analyzed by flotation and sedimentation.

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Populations of the coati, Nasua nasua, like the populations of other wild animals, are regulated by several biotic or abiotic factors. For example, parasites act as a biotic factor affecting the dynamics and density of coati populations. The parasitic nematodes of coatis include Dirofilaria species, such as Dirofilaria immitis, Dirofilaria repens, and Dirofilaria incrassata.

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Gastrointestinal parasitism by helminths and protozoa poses risks to animal and human health owing to clinical changes and transmission of potentially zoonotic agents. Thus, the present study aimed to verify the occurrence of gastrointestinal parasites in dogs from the municipality of Cuiabá, Mato Grosso, Brazil, using coproparasitological tests. From June 2021 to April 2022, faecal samples were collected from domestic dogs at the Veterinary Hospital and Animal Protection Shelters in the Cuiabá municipality.

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Ctenocephalides felis is the most common hematophagous ectoparasite of domestic cats and dogs worldwide, causing allergic dermatitis, anemia, itching, discomfort, and it is responsible for the transmission of many pathogens. In cattle, parasitism is not common but occurs due to the high adaptability of this flea species. This study aimed to report infestation of a Nellore (Bos indicus) calf from Northern Brazil by C.

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Although the common opossum, Didelphis marsupialis (Didelphimorphia: Didelphidae) is a species widely distributed in South America, knowledge about their helminth parasites and helminth community structure is scarce. The aims of this study were to describe the species composition and analyze the structure of the helminth community of the common opossum in an area of the Amazonian Arc in northern Mato Grosso. The helminths were recovered, counted, and identified in 32 individuals.

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Cats naturally exposed to have been described in different regions of the world, but little is known about the genotypes associated with infection in these animals. To detect -specific antibodies and investigate the TRP genotypes in cats, serum samples from 76 domestic cats reactive to crude antigens by the indirect fluorescence antibody test (IFAT) were analyzed by ELISA, using -specific peptides (i.e.

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This is the first scientific report of the ectopic occurrence of Dioctophyma renale in subcutaneous tissue of a domestic dog's paw from Bolivia. An 18-month-old male dog (Pug) from Bolivia (San Matías) was examined on September 15, 2020 presenting limited mobility and apparent swelling in the left pelvic limb. After clinic evaluation, left foot edema was observed from tibio-tarsal to metatarsophalangeal joints which was more pronounced on the dorsolateral face.

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Article Synopsis
  • * The affected dog, a male Pinscher living near sheep farms, displayed symptoms like hair loss, itching, and skin lesions, with tests confirming the presence of P. ovis.
  • * Treatment involved ivermectin and environmental control, leading to positive outcomes in alleviating the dog's condition.
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This is the first report of a primary corneal fibrosarcoma in a canine. A 4-year-old male dog, Blue Heeler, owas examined because of a reddish nodular mass in the right eye. A complete ophthalmic exam was conducted, including slit-lamp biomicroscopy, applanation tonometry, fundoscopy, ocular and abdominal ultrasound, hemogram, serum biochemistry profile, and a thoracic X-ray.

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Habitat modification may facilitate the emergence of novel pathogens, and the expansion of agricultural frontiers make domestic animals important sources of pathogen spillover to wild animals. We demonstrate for the first time that Plasmodium juxtanucleare, a widespread parasite from domestic chickens, naturally infects free-living passerines. We sampled 68 wild birds within and at the border of conservation units in central Brazil composed by Cerrado, a highly threatened biome.

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Platynosomiasis is a common feline hepatic disease caused by Platynosomum fastosum (Trematoda - Dicrocoelidae), which is also known as 'lizard poisoning'. Most reports of feline platynosomiasis show that this disease is sporadic and manifests with uncommon lesions; its pathogenicity is still not well understood. This study aimed to describe liver injuries and enzymatic changes associated with natural P.

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Some tick-borne pathogens that infect domestic cats have been considered emergent in veterinary medicine. Occurrences of Hepatozoon spp., Babesia spp.

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Ehrlichiosis is a worldwide distributed disease caused by different bacteria of the Ehrlichia genus that are transmitted by arthropod vectors. Its occurrence in dogs is considered endemic in several regions of Brazil. Regarding cats, however, few studies have been done and, consequently, there is not enough data available.

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