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1.
São Paulo; s.n; 2010. 97 p. tab.
Thesis in Portuguese | LILACS | ID: lil-575209

ABSTRACT

Vibrio fluvialis é um microorganismo que provoca a gastroenterite muito semelhante à cólera, mas também há relatos de casos extra-intestinais como sepse, ferida, peritonite e celulite hemorrágica e encefalite. Acredita-se que a infecção por esse microorganismo esteja vinculada ao consumo de peixes crus ou mal cozidos contaminados e / ou frutos do mar. A identificação dessa bactéria por métodos fenotípicos continua a ser um problema devido à sua grande semelhança com Aeromonas hydrophila e V.furnissii; por isso, a utilização de uma ferramenta de diferenciação entre essas espécies é importante. Nas últimas décadas, o aumento da resistência aos antimicrobianos tem sido um fator preocupante, porque ela interfere na escolha dos medicamentos para o tratamento eficaz e há uma necessidade de rápida produção de novos antibióticos. Ambientes costeiros e estuários estão em perigo de serem contaminados por esgoto, que pode conter drogas que agem de forma seletiva, permitindo o desenvolvimento de resistência aos antimicrobianos. Vários estudos demonstraram que estirpes clínicas de V. fluvialis são resistentes a múltiplas drogas. Objetivos - Desenvolver um marcador molecular baseado no 16S rDNA capaz de detectar o grupo V. fluvialis-V. furnissii, e avaliar a susceptibilidade a antibióticos destas espécies, principalmente a partir de amostras ambientais. Métodos - Após a elaboração dos iniciadores a partir do alinhamento das espécies do gênero Vibrio, foram utilizadas cepas identificadas fenotipicamente como V. fluvialis e de V. furnissii para a sua detecção molecular. O perfil de susceptibilidade a antibióticos pelo método da disco-difusão foi realizada, assim como a investigação molecular da presença do elemento SXT e de seus genes de resistência a antimicrobianos. Resultados: Com a utilização dos iniciadores desenvolvidos foi possível confirmar corretamente as espécies. Observou-se alta porcentagem de resistência a ampicilina e cefalotina, sendo que 65,9por cento...


Vibrio fluvialis is a microorganism that causes gastroenteritis very similar to cholera, however there are also reports of extraintestinal cases as sepse, skin wounds, peritonitis and hemorrhagic cellulitis and cerebritis. It is believed that infection by this organism is linked to the consumption of raw or undercooked contaminated fish and / or seafood. Identification of this bacteria by phenotypic methods remains a problem due to its great similarity with Aeromonas hydrophila and V.furnissii, therefore the use of a tool to differentiate these species is important. In recent decades, increasing antimicrobial resistance has been a concerning factor because it interferes in the choice of drugs for effective treatment and there is a need for rapid production of new antibiotics. Coastal and estuarine environments are in danger of being contaminated by sewage, which may contain drugs that will act selectively, allowing the development of antimicrobial resistance. Several studies have demonstrated that clinical strains of V. fluvialis are resistant to multiple drugs. Objectives - To develop a 16S rDNA - molecular marker able to detect the group V. fluvialis-V.furnissii, and to evaluate the antibiotic susceptibility of this species mainly from environmental samples. Methods - After the development of primers from alignment of the genus Vibrio strains phenotypically identified as V. fluvialis and V. furnissii were used for their molecular identification. The profile of antibiotic susceptibility was performed by the disk diffusion method, and the molecular investigation of the presence of the SXT element and their antimicrobial resistance genes. Results - The primers developed were able to confirm correctly the species. A high percentage of resistance to ampicillin and cephalothin was observed, V. fluvialis and V. furnissii showed resistance to at least two of the antibiotics used, 65.9 per cent and 43.24 per cent respectively. Only in one strain of...


Subject(s)
Drug Resistance, Microbial , Environmental Hazards , Vibrionaceae , Vibrionaceae/isolation & purification , Anti-Bacterial Agents , Molecular Biology/methods , Genetic Markers , Genetic Markers/genetics
2.
Microbiology ; (12)1992.
Article in Chinese | WPRIM | ID: wpr-683692

ABSTRACT

A gram-negative bacillus was isolated from the bodies of dead clams among clambanks along the south beach of Jiangsu province. It was confirmed to the Vibrio furnissii by morphological and biochemical characteristic examinations. This isolate grows well in clam's body fluid media and may multiply rapidly in sea-water at temperature about 25—37℃. It is of high toxicity. The healthy clams were all diseased with the same syndrome and died as natural illness by inoculate them with the isolate. It is considered that the large enormous death of clams along the south beach of Jiansu province is concerned with the wide spreading of the clam's infectious disease caused by Vibrio furnissii which hasn't been reported both internal and abroad.

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