Congestive heart failure in a young cat with excessive moderator bands (false tendons) in the left ventricle / Insuficiência cardíaca congestiva em um gato jovem com bandas moderadoras excessivas (falsos tendões) em ventrículo esquerdo

ABSTRACT: Left ventricular false tendons are fibrous or fibromuscular bands that transverse the ventricular cavity and have no attachment to the mitral valve in many species. In cats it is considered a congenital defect that is rarely related to clinical disease and death in adult cats. A 45 days-old mixed breed cat had a history of inappetence since birth. At the physical exam the patient was lethargic and presented restrictive dyspnoea. At necropsy, there were marked ascites, hydrothorax, hepatomegaly with enhanced lobular pattern (nutmeg liver), and the lungs were markedly diminished (compressive pulmonary atelectasis). The heart was enlarged due to marked dilation of the cardiac chambers. Moreover, multiple slightly whitish and irregular cord-like structures were connecting the posterior papillary muscle to the interventricular septum (excessive moderator bands /left ventricular false tendons) at the left ventricle. Microscopically, these structures were characterized by a marked proliferation of fibrous connective tissue intermixed with Purkinje cells and well-differentiated cardiomyocytes lined by a single layer of endocardium. This study described a case of excessive moderator bands (left ventricular false tendons) in a young cat associated with congestive heart failure and death.

RESUMO: Falsos tendões são bandas fibrosas ou fibromusculares que atravessam a cavidade do ventrículo esquerdo, sem ligação com a valva mitral, em várias espécies. Nos gatos, a alteração é considerada um defeito congênito que raramente está relacionada com alterações clínicas e morte em gatos adultos. Um gato de 45 dias de idade, sem raça definida e com histórico de inapetência desde o nascimento foi encaminhado para atendimento veterinário. Ao exame físico apresentou letargia e dispneia restritiva. À necropsia, havia acentuada ascite, hidrotórax, hepatomegalia com evidenciação do padrão lobular (fígado noz-moscada) e os pulmões apresentavam-se acentuadamente diminuídos (atelectasia pulmonar compressiva). O coração apresentava acentuada dilatação das câmaras cardíacas. Em ventrículo esquerdo, havia numerosas estruturas brancacentas semelhantes a cordas conectando o músculo papilar ao septo interventricular (bandas moderadoras excessivas/falsos tendões). Microscopicamente, estas estruturas apresentavam acentuada proliferação de tecido conjuntivo fibroso, além de células de Purkinje e cardiomiócitos bem diferenciadas revestidas por uma única camada de endocárdio. O objetivo deste trabalho é descrever um caso de bandas moderadoras excessivas (falsos tendões) em ventrículo esquerdo de um gato jovem com insuficiência cardíaca congestiva e morte.

Tuberculosis outbreak in intensive swine farming from southern Brazil / Surto de tuberculose em suínos de criação intensiva no Sul do Brasil

ABSTRACT: Mycobacterium tuberculosis var. bovis is the etiologic agent of animal tuberculosis (aTB), a neglected zoonotic disease. Animal tuberculosis can affect many species, including swine. aTB-consistent granulomas in these animals lead to carcass disposal, generating economic losses and posing risks to human health. In the present study, an aTB outbreak was identified at an intensive swine farming operation in Southern Brazil. Inspection during swine slaughter revealed aTB-suspected lesions, which were collected for diagnosis by histology, PCR, and bacterial isolation. The animals had no clinical signs of tuberculosis. Granulomatous lesions were identified in 0.73% (59/8,071) of the slaughtered swine, and were confirmed by histology. Nine samples were further examined by PCR and bacterial isolation, with 44.4% and 55.5% positive results, respectively. Data from abattoirs subjected to federal surveillance show an aTB prevalence in Brazil of <0.001%. The present data thus indicate a swine aTB outbreak in intensive breeding. Swine infection can be related to exposure to infected animals or to contaminated food or environment. Biosecurity measures must be taken to avoid aTB transmission. Although certified swine breeding farms adopt such measures, this report indicates that constant monitoring is crucial, and greater control in swine breeding and finishing units is required to prevent outbreaks and spread of tuberculosis.

RESUMO: Mycobacterium bovis é o agente etiológico da tuberculose animal (aTB), uma doença zoonótica negligenciada. A tuberculose animal pode afetar muitas espécies, incluindo suínos. Os granulomas compatíveis com a aTB nesses animais levam ao descarte de carcaças, gerando perdas econômicas e trazendo riscos à saúde humana. No presente estudo, um surto de aTB foi identificado em um sistema de criação intensiva de suínos na região Sul do Brasil. A inspeção durante um abate de suínos revelou lesões suspeitas de tuberculose, as quais foram coletadas para diagnóstico por histologia, PCR e isolamento bacteriano. Os animais não apresentavam sinais clínicos de tuberculose. Lesões granulomatosas foram identificadas em 0,73% (59/8.071) dos suínos abatidos, e foram confirmadas pela histologia. Nove amostras foram posteriormente examinadas por PCR e isolamento bacteriano, com 44,4% e 55,5% de resultados positivos, respectivamente. Dados de frigoríficos submetidos à vigilância federal demostram prevalência da aTB de < 0,001% no Brasil. Os dados presentes indicam, portanto, um surto de aTB em suínos de criação intensiva. A infecção em suínos pode estar relacionada à exposição a animais infectados, alimentos ou ambientes contaminados. Medidas de biossegurança devem ser tomadas para evitar a transmissão da aTB. Embora as granjas suinícolas certificadas adotem tais medidas, este relato indica que o monitoramento constante é crucial, e maior controle nas unidades de criação e terminação de suínos é necessário para prevenir surtos e disseminação da tuberculose.

Mycobacterium tuberculosis var. tuberculosis infection in two captive black capuchins (Sapajus nigritus) in Southern Brazil.

Tuberculosis is a common zooanthroponosis in humans with a high incidence in Brazil, but it may also affect non-human primates (NHPs), of which Old World primates are most commonly involved. Nonetheless, its occurrence in New World primates is unknown, and therefore, this study aimed to describe the infection by Mycobacterium tuberculosis variant tuberculosis in two captive black capuchin monkeys (Sapajus nigritus) in Southern Brazil. The primates were housed in the same enclosure, wherein close contact with humans frequently occurred, and presented apathy, anorexia, and death in a clinical course of 15 days to 2 months. At the necropsy, the tracheobronchial lymph nodes were markedly enlarged and firm to hard and on the cut surface had a caseous aspect. The lungs exhibited two injury patterns: multifocal and disseminated. Microscopically, the lungs exhibited multifocal to coalescing necrotic granulomas and non-necrotic granulomas, with multiple acid-fast bacilli within the cytoplasm of epithelioid macrophages and multinucleated giant cells. Bacilli were also labeled upon immunohistochemistry (IHC) for Mycobacterium tuberculosis. Microbiological culture of lung samples from both cases yielded colonies compatible with M. tuberculosis. The isolates were identified as M. tuberculosis var. tuberculosis through polymerase chain reaction (PCR). Although tuberculosis is poorly described in New World primates, M. tuberculosis var. tuberculosis may cause a highly contagious and progressive disease with high mortality in black capuchin monkeys (S. nigritus).

Identification of Reptarenaviruses, Hartmaniviruses, and a Novel Chuvirus in Captive Native Brazilian Boa Constrictors with Boid Inclusion Body Disease.

Boid inclusion body disease (BIBD) is a transmissible viral disease of captive snakes that causes severe losses in snake collections worldwide. It is caused by reptarenavirus infection, which can persist over several years without overt signs but is generally associated with the eventual death of the affected snakes. Thus far, reports have confirmed the existence of reptarenaviruses in captive snakes in North America, Europe, Asia, and Australia, but there is no evidence that it also occurs in wild snakes. BIBD affects boa species within the subfamily Boinae and pythons in the family Pythonidae, the habitats of which do not naturally overlap. Here, we studied Brazilian captive snakes with BIBD using a metatranscriptomic approach, and we report the identification of novel reptarenaviruses, hartmaniviruses, and a new species in the family Chuviridae The reptarenavirus L segments identified are divergent enough to represent six novel species, while we found only a single novel reptarenavirus S segment. Until now, hartmaniviruses had been identified only in European captive boas with BIBD, and the present results increase the number of known hartmaniviruses from four to six. The newly identified chuvirus showed 38.4%, 40.9%, and 48.1% amino acid identity to the nucleoprotein, glycoprotein, and RNA-dependent RNA polymerase, respectively, of its closest relative, Guangdong red-banded snake chuvirus-like virus. Although we cannot rule out the possibility that the found viruses originated from imported snakes, the results suggest that the viruses could circulate in indigenous snake populations.IMPORTANCE Boid inclusion body disease (BIBD), caused by reptarenavirus infection, affects captive snake populations worldwide, but the reservoir hosts of reptarenaviruses remain unknown. Here, we report the identification of novel reptarenaviruses, hartmaniviruses, and a chuvirus in captive Brazilian boas with BIBD. Three of the four snakes studied showed coinfection with all three viruses, and one of the snakes harbored three novel reptarenavirus L segments and one novel S segment. The samples originated from collections with Brazilian indigenous snakes only, which could indicate that these viruses circulate in wild snakes. The findings could further indicate that boid snakes are the natural reservoir of reptarena- and hartmaniviruses commonly found in captive snakes. The snakes infected with the novel chuvirus all suffered from BIBD; it is therefore not possible to comment on its potential pathogenicity and contribution to the observed changes in the present case material.

Pulmonary Langerhans cell histiocytosis in cats and a literature review of feline histiocytic diseases.

OBJECTIVES: The aim of this study was to report the clinical, radiographic and pathological features of pulmonary Langerhans cell histiocytosis in four cats, and carry out a literature review of feline histiocytic diseases. METHODS: Necropsy reports archived at the Department of Veterinary Pathology of the Federal University of Rio Grande do Sul were reviewed. The clinical information was then obtained from the clinical records at the Veterinary Hospital. Routine samples had been collected during necropsy, fixed in 10% formalin, routinely processed for histology, and stained with hematoxylin and eosin. Samples of lung were submitted for bacterial and fungal culture. Tissue sections of lung underwent immunohistochemical testing for vimentin, pancytokeratin, CD18, CD3, CD79αcy, E-cadherin and Iba1. RESULTS: This disease affected mixed breed cats aged 7-14 years. Clinical signs consisted of severe mixed inspiratory and expiratory restrictive dyspnea, lethargy and anorexia. Thoracic radiographs revealed different lesion profiles, predominantly of an interstitial and alveolar pattern. Grossly, the lungs were diffusely firm and did not collapse. The pleural surface was bright and irregular due to multifocal-to-coalescent, well-demarcated, white, firm nodules that also extended into and obliterated the pulmonary parenchyma. Histological changes were characterized by poorly demarcated infiltration with histiocytic cells arranged in cohesive groups within the alveolar, bronchiolar and bronchial spaces. Histiocytic cells had intense cytoplasmic immunolabeling for vimentin and Iba1, and robust membrane immunolabeling with CD18 and E-cadherin; these cells were negative for CD3, CD79αcy and pancytokeratin in all cases. CONCLUSIONS AND RELEVANCE: This article confirms that pulmonary Langerhans cell histiocytosis is a rare disease that occurs in middle-aged to older cats and causes widespread involvement of the pulmonary parenchyma, inducing acute or chronic, progressive respiratory disease characterized by mixed restrictive dyspnea that eventually leads to death. While a definitive clinical diagnosis is challenging, the nodular appearance of the pulmonary changes, together with the histological and immunohistochemistry findings, suffice for diagnostic confirmation of pulmonary Langerhans cell histiocytosis.

Carcinoid of the gallbladder in two dogs / Carcinoide de vesícula biliar em dois cães

ABSTRACT: A carcinoid is a rare neoplasm derived from neuroendocrine cells that may arise in the hepatobiliary system. This report described two cases of carcinoid of the gallbladder in dogs, with emphasis on the clinical, pathological and immunohistochemical aspects. Case 1 was a 10-year-old female Shih Tzu, with a history of prostration and occasional episodes of diarrhea and vomiting. Case 2 was a 10-year-old male Cocker Spaniel, with a history of diarrhea and abdominal pain. Abdominal ultrasonography suggested a neoplasm of the gallbladder in both cases. The dogs underwent cholecystectomy, and 10% formalin-fixed samples were sent for pathological examination. Histologically, a neoplastic proliferation of neuroendocrine cells was observed in the gallbladder submucosa of both cases. Immunohistochemical labeling for neuroendocrine antibodies, such as synaptophysin, neuron-specific enolase and chromogranin A, confirmed the diagnoses. Carcinoid of the gallbladder is a rare neoplasm in dogs, without specific clinical signs, but should be included in the differential diagnosis of lesions that affect this organ.

RESUMO: Carcinoide é um neoplasma raro derivado de células neuroendócrinas, que pode surgir no sistema hepatobiliar. Este relato descreve dois casos de carcinoide da vesícula biliar em cães, com ênfase nos aspectos clínicos, patológicos e imuno-histoquímicos. O caso 1 era uma fêmea, Shih Tzu de 10 anos de idade, com histórico de letargia e ocasionais episódios de diarreia e vômito. O caso 2 era um macho, Cocker Spaniel de 10 anos, que apresentava diarreia e dor abdominal. Através da ultrassonografia abdominal foi sugerida neoplasia na vesícula biliar em ambos os casos. Os caninos foram submetidos à colecistectomia e amostras em formol a 10%, seguidamente, foram enviadas para o laboratório de patologia. Histologicamente, observou-se proliferação neoplásica de células neuroendócrinas na submucosa da vesícula biliar nos dois casos. A marcação imuno-histoquímica para os anticorpos neuroendócrinos, como sinaptofisina, enolase específica de neurônios e cromogranina A confirmou o diagnóstico. Carcinoide de vesícula biliar é uma neoplasia rara em cães, sem sinais clínicos específicos, mas deve ser incluída no diagnóstico diferencial das lesões que afetam esse órgão.

Mannheimia haemolytica pleuropneumonia in goats associated with shipping stress / Pleuropneumonia por Mannheimia haemolytica em caprinos associada ao estresse de transporte

ABSTRACT: This study described the epidemiological, clinical, pathological and bacteriological aspects of Mannheimia haemolytica pleuropneumonia in goats associated with shipping stress. Forty goats transported from the Northeast to the Southern region of Brazil died during shipment, or 2-3 days after unloading. Clinical signs included dyspnea, mucopurulent nasal discharge, and coughing. All goats were necropsied, and multiple tissues were collected for histopathological analysis and involved agent identifications. All lungs showed pulmonary consolidation, predominantly affecting the cranioventral lobes, in addition to the marked fibrinous pleuritis, pleural thickening, and pleural adhesions, that affected 90% of the goats. Histologically, there was fibrino-suppurative pleuropneumonia characterized by a diffuse neutrophilic infiltrate admixed with fibrin. Non-hemolytic [85% (34/40)] and hemolytic [15% (6/40)] species were obtained in bacteriological culture. Fir Mannheimia spp. was reported in 26 isolates and subsequently confirmed as M. haemolytica (99% identity), after amplification and partial sequencing of the 16S rDNA gene. Stress may trigger the development of bacterial pleuropneumonia in goats, and non-hemolytic strains of M. haemolytica may cause this condition in goats with severe immunosuppression.

RESUMO: Descreve-se os aspectos epidemiológicos, clínicos, patológicos e bacteriológicos da pleuropneumonia por Mannheimia haemolytica em caprinos, após transporte prolongado. Quarenta caprinos transportados da região Nordeste para a região Sul do Brasil morreram durante a viagem ou 2-3 dias após o desembarque. Clinicamente, observou-se dispneia, secreção nasal mucopurulenta e tosse. Na necropsia foram coletados múltiplos fragmentos de órgãos para análises histopatológicas e identificação do agente envolvido. Todos os pulmões apresentaram consolidação pulmonar predominantemente em região cranioventral, associada à deposição acentuada de fibrina, espessamento e aderência pleurais em 90% dos casos. Histologicamente, havia pleuropneumonia fibrinossupurativa caracterizada por infiltrado neutrofílico difuso associado à fibrina. Colônias não hemolíticas [85% (34/40)] e hemolíticas [15% (6/40)] foram obtidas pelo isolamento bacteriológico. Mannheimia spp. foi isolada em 26 amostras, os quais posteriormente foram confirmados como Mannheimia haemolytica (99% de identidade), pela amplificação e sequenciamento parcial do gene 16S rDNA. O estresse pode favorecer o desenvolvimento de pleuropneumonia bacteriana em caprinos, e cepas não hemolíticas de M. haemolytica podem causar doença em animais com imunodepressão acentuada.

Rare case of acute toxoplasmosis in a domestic rabbit (Oryctolagus cuniculus) in Brazil associated with the type BrIII Brazilian clonal lineage of Toxoplasma gondii.

Toxoplasmosis is a widely distributed disease that infects birds and mammals, including humans. Acute clinical course of toxoplasmosis is considered to be rare among domestic rabbits (Oryctolagus cuniculus). The aim of this study was to present the first report of fatal acute disease caused by Toxoplasma gondii type BrIII genotype, a typical Brazilian clonal lineage, in a domestic rabbit. T. gondii was identified in histological sections of spleen and liver tissue, and these tissues were also immunohistochemically positive for T. gondii. After the histopathological and immunohistochemical confirmation of T. gondii, the genotype of this pathogen was determined via PCR-RFLP with 11 markers (SAG1, SAG2, SAG3, BTUB, GRA6, c22-8, c29-2, L358, PK1, Apico, and CS3) and via microsatellite (MS) analysis with 15 markers (TUB2, W35, TgMA, B18, B17, M33, IV.1, X1.1, M48, M102, N60, N82, AA, N61, and N83). This study shows that type BrIII genotype, circulating in Brazil in different hosts, can cause acute disease in a naturally infected animal host. The described case also involves the first reported occurrence of the 291 allele for the typing marker TUB2 in a type BrIII strain, emphasizing the genetic diversity of T. gondii in Brazil.