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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Avalia??o das les?es de pele e do leucograma em coelhos (Oryctolagus cuniculus) infestados por Stomoxys calcitrans (L) (D?ptera:Muscidae). / Evaluation of skin lesions and hematology changes in rabbits (Oryctolagus cuniculus) caused by Stomoxys calcitrans (L) (D?ptera:Muscidae)

Chagas, Walker Nunes 27 February 2009 (has links)
Made available in DSpace on 2016-04-28T20:16:30Z (GMT). No. of bitstreams: 1 2009 - Walker Nunes Chagas.pdf: 2208171 bytes, checksum: 4a3ea912994eedc94099aff215e6bce1 (MD5) Previous issue date: 2009-02-27 / This experiment aimed to evaluate and compare the macro and microscopic changes in the skin of rabbits caused by the bites of Stomoxys calcitrans, for different levels, repeat attacked and not attacked animals. The profile of leukocyte expression in circulating blood also was analyzed. The experiment was conducted at the Technical College UFRRJ, in the municipality of Serop?dica (RJ). Thirty male New Zealand White rabbits, with 96 to 105 days of age, were divided into five groups, each with six animals and subjected to bites of S. calcitrans in one ear, with three, seven and 14 flies respectively. Another group was submitted to repeat bites of 14 flies, and the fifth group was not submitted to S. calcitrans (control). Forty-eight hours after the attack, fragments of skin were colleted for histopathological. Blood samples also were colleted for hematology. The macroscopic histopathological findings indicate that the bites led to the development dermatitis. Microscopically, 19 rabbits (79,2%) developed hyperkeratosis. Three animals evidenced acanthosis. Also in three animals were observed crusts of exudation with red blood cells and cellular debris. One of these rabbits showed erosive lesions associated with the crust and slight spongiosis. The interstitial edema, classified as slight to moderate, was present in 18 animals (75%). Dilated lymphatic vessels were found in 15 rabbits (62.5%). Eleven attacked rabbits showed interstitial hemorrhage (45.8%). Twenty-two rabbits in the experimental group (91.7%) showed congestion of blood vessels. Some kind of inflammatory infiltration was observed in 15 attacked rabbits (62.5%), whilst no rabbit in the control group showed this change. Thirteen rabbits (54.2%) showed inflammatory infiltrates of predominantly polymorphonuclear and eosinophilic cells, and 14 rabbits (58.3%) evidenced of mononuclear cells, predominantly histiocytes, but not mast cells. The animals submitted to repeat bites showed reduction of leukocytes. The other attacked animals showed reduction of lymphocytes and eosinophils and increase to neutrophils and monocytes. / O presente experimento teve como objetivos avaliar as altera??es macro e microsc?picas na pele de coelhos, causadas pelas picadas da mosca Stomoxys calcitrans, em rela??o a diferentes intensidades de infesta??o, a re-infesta??o e a animais n?o parasitados, bem como analisar e descrever a resposta leucocit?ria sang??nea, nos animais dos diferentes grupos. O Experimento foi conduzido no Col?gio T?cnico da UFRRJ, no munic?pio de Serop?dica (RJ). Trinta coelhos machos, Nova Zel?ndia brancos, com idade entre 96 e 105 dias, foram divididos em cinco grupos, com seis animais cada e submetidos ?s infesta??es experimentais por S. calcitrans em uma das orelhas, com tr?s, sete e quatorze moscas respectivamente. Um outro grupo foi submetido ? reinfesta??o, quinze dias ap?s, com quatorze moscas e no quinto grupo os coelhos n?o foram submetidos ?s picadas (controle). Quarenta e oito horas ap?s a infesta??o, foram realizadas a coleta de fragmentos de pele para avalia??o histopatol?gica e pun??o venosa, com realiza??o de esfrega?o sangu?neo para leucocitoscopia. No momento da realiza??o das bi?psias n?o foram observadas altera??es macrosc?picas significativas e os achados histopatol?gicos indicaram que as infesta??es nos animais deste experimento determinaram o desenvolvimento de dermatites do tipo perivascular e intersticial. Microscopicamente, dezenove animais (79,2%) apresentaram hiperqueratose ortocerat?tica compacta. Tr?s apresentaram acantose e crostas serocelulares (exudativas), com hem?cias e debris celulares. Um destes coelhos apresentou les?o erosiva associada ? crosta e discreta espongiose. O edema intersticial, classificado como discreto a moderado, estava presente em 18 animais (75%). Foi evidenciada linfangectasia em 15 coelhos (62,5%). Onze coelhos do grupo experimental apresentaram hemorragia intersticial (45,8%). Vinte e dois coelhos do grupo experimental (91,7%) apresentaram congest?o dos vasos sangu?neos. Algum tipo de infiltrado inflamat?rio foi observado em 15 coelhos (62,5%) dos grupos experimentais, enquanto que nenhum coelho do grupo controle apresentou esta altera??o. Treze coelhos (54,2%) apresentaram infiltrado inflamat?rio de polimorfonucleares, predominantemente eosinof?lico e 14 (58,3%) de mononucleares, predominantemente histioc?tico, onde n?o foi evidenciada a presen?a de mast?citos. Os animais submetidos ? reinfesta??o apresentaram leucopenia e nos demais grupos experimentais foi observado linfocitopenia, eosinopenia, e heterofilia e monocitose. Os achados histopatol?gicos s?o compat?veis com as rea??es de hipersensibilidade do tipo I. Os coelhos infestados por mais moscas apresentaram resposta inflamat?ria mais intensa e nos animais submetidos ? reinfesta??o as altera??es teciduais se apresentam com maior intensidade. A infesta??o por S. calcitrans e a intensidade desta, determina altera??es no leucograma dos coelhos. Na reinfesta??o por S. calcitrans, o leucograma ? compat?vel com o de uma rea??o cr?nica.

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