RESUMO
In this article, we describe a basic practical laboratory designed for fifth-year undergraduate students of Microbiology as part of the Epidemiology course. This practice provides the students with the tools for molecular epidemiological analysis of pathogenic microorganisms using a rapid and simple PCR technique. The aim of this work was to assay RAPD-PCR technique in order to infer possible epidemiological relationships. The activity gives students an appreciation of the value of applying a simple molecular biological method as RAPD-PCR to a discipline-specific question. It comprises a three-session laboratory module to genetically assay DNAs from strains isolated from a food outbreak. © 2016 by The International Union of Biochemistry and Molecular Biology, 44(4):391-396, 2016.
Assuntos
Surtos de Doenças/estatística & dados numéricos , Epidemiologia Molecular/educação , Reação em Cadeia da Polimerase/métodos , Aprendizagem Baseada em Problemas/métodos , Técnica de Amplificação ao Acaso de DNA Polimórfico/métodos , Saccharomyces cerevisiae/genética , Estudantes/psicologia , Currículo , DNA Bacteriano/genética , Avaliação Educacional , Humanos , Saccharomyces cerevisiae/isolamento & purificaçãoRESUMO
Bacteriological contamination of well water and wash water in a random sample obtained from 50 farms from Villa María (Córdoba) dairy area, Argentina, was evaluated during a visit in 2007. Forty six percent and 24 % of farms showed an aerobic mesophilic bacteria count higher than 500 CFU/ml in wash water and well water, respectively. Escherichia coli was isolated in 20 % of samples from both sources. Pseudomonas aeruginosa showed high frequency of isolation in well water (36 %) and wash water (42 %). Eighty and eighty-eight percent of dairy farms have contaminated well water and wash water, respectively. The findings show moderate concordance between contamination of well water and wash water for mesophilic aerobics and total coliforms. The results reveal that a high percentage of dairy farms in the basin under study have poor bacteriological water quality, not suitable for milking and washing facilities.
Assuntos
Indústria de Laticínios , Microbiologia da Água , Poluição da Água , Abastecimento de Água/normas , Animais , Argentina , Bactérias Aeróbias/isolamento & purificação , Bovinos , Enterobacteriaceae/isolamento & purificação , Escherichia coli/isolamento & purificação , Pseudomonas aeruginosa/isolamento & purificação , Estudos de Amostragem , Eliminação de Resíduos LíquidosRESUMO
Se evaluó la calidad bacteriológica del agua de pozo y del agua de lavado en una muestra aleatoria de 50 tambos distribuidos en la cuenca lechera de Villa María (Córdoba), Argentina. La visita a los tambos se realizó en 2007. Un 46 % y un 24 % de los tambos presentaron recuentos de aerobios mesófilos superiores a 500 UFC/ml en el agua de lavado y en el agua de pozo, respectivamente. En un 20 % de los establecimientos se aisló Escherichia coli de ambas fuentes de agua. Pseudomonas aeruginosa registró una alta frecuencia de aislamiento en el agua de pozo (36 %) y en la de lavado (42 %). Un 80 % y un 88 % de los establecimientos contaban con agua de pozo y de lavado no aptas, respectivamente. Los niveles de mesófilos aerobios y de coliformes totales presentes en el agua de pozo mostraron una concordancia moderada con los detectados en el agua destinada al lavado. En virtud de estos resultados, puede afirmarse que un elevado porcentaje de los tambos ubicados en la cuenca lechera de Villa María emplean agua de calidad bacteriológica deficiente, no apta para el ordeño ni el lavado de las instalaciones.
Bacteriological contamination of well water and wash water in a random sample obtained from 50 farms from Villa María (Córdoba) dairy area, Argentina, was evaluated during a visit in 2007. Forty six percent and 24 % of farms showed an aerobic mesophilic bacteria count higher than 500 CFU/ml in wash water and well water, respectively. Escherichia coli was isolated in 20 % of samples from both sources. Pseudomonas aeruginosa showed high frequency of isolation in well water (36 %) and wash water (42 %). Eighty and eighty-eight percent of dairy farms have contaminated well water and wash water, respectively. The findings show moderate concordance between contamination of well water and wash water for mesophilic aerobics and total coliforms. The results reveal that a high percentage of dairy farms in the basin under study have poor bacteriological water quality, not suitable for milking and washing facilities.
