Browsing by Author "Mega, A. C."
Now showing 1 - 10 of 20
Results Per Page
Sort Options
- Canine and feline oral pathologyPublication . Costa, S.; Pais, B.; Almeida, D.; Simões, J.; Mega, A. C.; Vala, HelenaThe aim of this work was to present a brief review of the main conditions affecting the oral cavity of dogs and cats. In recent years there has been increased attention with regard to veterinary dentistry, being several and frequent the pathologies located in the oral cavity of our pets. These diseases mainly affect the teeth and the mucous membranes of the oral cavity, and may, in chronic cases, also affect vital organs. This condition could have different causes, including hereditary, congenital, infectious, tumoural and even traumatic, requiring specific therapeutic approaches (Bellows, 2010; Holmstrom et al., 2007).
- A case of intense and multiple parasitic infestation in a wild pigeon (Columbia livia).Publication . Coelho, C.; Nóbrega, C.; Santos, C.; Cruz, R.; Mesquita, J.; Oliveira, A. L.; Mega, A. C.; Esteves, F.; Vala, HelenaIntroduction The prevalence of parasitic diseases in poultry seems to have significantly reduced due not only to the intensive production system but also to the improving conditions of hygiene and management practiced. However, parasitic diseases continue to have great importance in traditional production systems and production systems in the outdoors, contributing significantly to productivity decline of these farms. The pigeon (Columbia livia), a specie produced with outdoors access is more susceptible to infestations. The growing population of wild pigeons in urban areas can be decisive in the infestation of domestic pigeons, since they share the same places and their sanitary control is more difficult. Objectives The aim of this work is to describe a case of a pigeon (Columbia livia) with an intense parasitic infestation, this being the cause of death, with common parasitic species and other less frequent. Material and Methods A cadaver of a pigeon was submitted to the necropsy of Anatomic Pathology Laboratory of the Agrarian Superior School of Viseu, a detailed post mortem examination was carried out and samples were taken. All samples were fixed in 10% neutral-buffered formalin, for a maximum of 48 hours and processed following the routine histopathological technique. Results Gross examination lesions revealed rounded red lesions in the proventriculus serosa and lung congestion. Microscopic examination confirmed severe lung congestion, with hemosiderosis and the presence of numerous nematodes in cross section, discussing the hypothesis that it might be a case of Cyathostoma bronchialis (Muehlig 1884), taking into account the location or, less likely, an erratic parasite in histotropic migration phase. Eggs observed at this location had thick shell, oval shape, some were embryonated and 35-40 μm in length by 20-25 μm in width. In the lumen of the proventriculus glands, nematodes in cross section were also observed, noting numerous barrel-shaped eggs, embryonated larvae, oval poles and 55 mm in length by 25 mm in width, apparently compatible with parasites of the genus Tetrameres. Conclusion The high parasitic infestation of the wild pigeon specimen subjected to necropsy, with several, common and uncommon, species of parasites, the severity of lesions, leading to death of the animal, as well as the fact that infected wild birds favoring the spread of the parasite to the domestic pigeons and other poultry production, consisting of a major concern for producers, justifies the study of isolated cases, even constituting an epidemiological alert for the regions where they appear.
- Feline oral pathologyPublication . Costa, S.; Pais, B.; Almeida, D.; Simões, J.; Mega, A. C.; Vala, HelenaThe main pathologies of the oral cavity are of utmost importance, not only by the number of exposed individuals, but also by the consequences which stems. With the development of this work, we intend to conduct a brief approach to the same, since, specifically affecting domestic felines. Feline Lymphoplasmatic Gingivostomatitis (GELF), the Feline Odontoclastic Reabsorption Lesions (LROF) Complex and gingivitis-stomatitis-pharyngitis, have been studied, some of which are considered an enigma in veterinary dentistry, this is because there are still many uncertainties about the true causes, which sometimes cause irreversible damage.
- Gastrocanis – an internet-based epidemiologic surveillance tool.Publication . Sacramento R; Santos, C.; Vala, Helena; Esteves, F.; Oliveira, A. L.; Cruz, R.; Mega, A. C.; Nóbrega, C.; Mesquita, J. R.
- he Zoonotic Event of Leishmaniasis in Portugal: a Public Health Concern.Publication . Gouveia, A.; Santos, C; Vala, Helena; Esteves, F.; Oliveira, A. L.; Cruz, R.; Mega, A. C.; Nóbrega, C.; Mesquita, J. R.
- Histopathological assessment of renal lesions after volume replacement with HES 130/0.4 or Ringer solution, following acute bleedingPublication . Cruz, R.; Vala, Helena; Venâncio, C.; Mesquita, J.; Mega, A. C.; Silva, A.; Ortiz, A. L.; Ferreira, D.Background: Surgical blood loss can lead to ineffective tissue perfusion of vital organs, including the kidney. Physiologic solution chosen for blood volume replacement may be determinant for preserving renal integrity. Objectives: Study kidney histopathological changes in a hemorrhagic model, followed by intravascular volume replacement with Ringer's lactate or Hydroxyethylstarch 130/0.4 solutions. Methods: Thirty one pigs under general anaesthesia with propofol and remifentanil underwent haemorrhage at a volume of 25ml kg-1, over 20 minutes. After a waiting period, intravascular volume was replaced using HES 130/0.4 (group 1) and Ringer’s lactate (group 2). One hour after, pigs were euthanized and sixty two renal samples were taken for histopathological examination, using PAS staining. Renal damage was assessed for glomerular, tubulointerstitial and vascular lesions. Contingency tables for frequency analysis were used. Results: Mean arterial pressure values (MAP) reached 40 mmHg after bleeding, and recovered for values above 60 mmHg in both groups after volume replacement. Histopathological lesions observed in Group 2 were more frequent than those in Group 1. Conclusion: HES 130/0.4 may reduce the incidence of histopathological lesions secondary to renal hypoperfusion after severe bleeding when compared with Ringer Lactate. Results suggest that reestablishment of intravascular volume with HES 130/0.4 may preserve renal integrity secondary to blood loss.
- Human and animal dermatophytosis: is it a real Public Health issue?.Publication . Matos, A.; Santos, C.; Vala, Helena; Esteves, F.; Oliveira, A. L.; Cruz, R.; Mega, A. C.; Nóbrega, C.; Mesquita, J. R.
- Implementation of a canine gastroenteritis real-time participation and monitoring system: a possibly valuable epidemiological tool.Publication . Sacramento, R.; Santos, C.; Vala, Helena; Esteves, F.; Oliveira, A. L.; Cruz, R.; Mega, A. C.; Nóbrega, C.; Mesquita, J. R.
- Interstitial nephritis in avian pathology.Publication . Nóbrega, C.; Coelho, C.; Oliveira, A. L.; Mega, A. C.; Esteves, F.; Vala, HelenaIntroduction Interstitial nephritis often occurs in birds, associated with diverse aetiologies, including infectious and non-infectious ones. In the nephritis of infectious origin, we can highlight the viral origin, mainly avian nephritis virus (AVN), but also Newcastle disease, infectious bronchitis and Marek's disease and also nephritis of bacterial and parasitic origin. As non-infectious causes, we can point to the deposition of inflammatory proteins in the glomerular space that leads to glomerulonephritis. Moreover, pigeon are a growing specie in urban areas and their proximity with other birds, including poultry, favours propagation of diseases, however available studies on its health status and its possible interaction with other domestic specie are scarce, justifying increasingly deepening of cases in this species. Aim This work intends to make an update theme, using as examples two cases of interstitial nephritis in poultry, concomitantly with other common diseases. Material and methods Two birds with unspecific signs of lethargy and death occurring few hours later, were sent to the Laboratory of Pathology, Agrarian School of Viseu, to determine the cause of death. A detailed post-mortem examination was carried out, samples were taken and processed following the routine histopathological technique. Results No remarkable gross lesions were observed unless a slight congestion in one kidney. Microscopic examination revealed the presence of mononuclear cell infiltration in renal interstitium in one case and mixed inflammatory infiltrate in the other. Concomitantly, the birds had other common diseases, different in each case, discussing the significance of the presence of interstitial nephritis in birds as nonspecific secondary injury associated with other pathologies or specific and primary. Conclusion The presence of interstitial nephritis in a variety of avian diseases raises some questions, including why the kidney is so consistently affected. In mammals, there are several urinary pathologies that affect only the urinary system, but in birds, although this situation also exists, most urinary disorders are part of multi-systemic conditions. On the other hand, cases of pigeons with multisystem conditions, and given their role as transmitters of disease to other birds, represent an element of value to study nowadays.
- Leishmaniasis in Portugal: the Veterinary Nursing as a part of the solution.Publication . Gouveia A; Santos, C.; Vala, Helena; Esteves, F.; Oliveira, A. L.; Cruz, R.; Mega, A. C.; Nóbrega, C.; Mesquita, J. R.