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1.
Ciênc. rural (Online) ; 51(4): e20200417, 2021. tab
Article in English | LILACS-Express | LILACS | ID: biblio-1153884

ABSTRACT

ABSTRACT: The efficiency of the disinfectants used in the milking management is fundamental to the success in the dairy activity, being a critical point to the control of mastitis. The objective was to evaluate the in vitro efficacy of iodine used in pre and post-dipping against coagulase negative Staphylococcus (CNS). Thus, 53 CNS isolates were studied for the action of the 1.0% disinfectant and their serial dilutions of 0.5%, 0.375% and 0.25%, in addition to two commercial presentations of iodine in concentrations of 0.5% and 0.25%. The rate of CNS inhibition achieved by iodine at 0.375%, 0.5% and 1.0% for 60 seconds, was 60.4%. In 30 seconds, iodine at 0.5% and 1.0% showed a microbial inhibition rate of 52.8% and 56.6%, respectively. The other protocols tested were less efficient. It is concluded that the greatest in vitro disinfectant activity for CNS was demonstrated by iodine at 0.375%, 0.5% and 1.0%, for 60 seconds. Microbial susceptibility tests should be carried out periodically, as well as health education practices and corrective training on the property, in order to ensure udder health and mastitis control.


RESUMO: A eficiência dos desinfetantes empregados no manejo de ordenha é fundamental no sucesso na atividade leiteira, sendo um ponto crítico ao controle da mastite. Objetivou-se avaliar a eficácia in vitro do iodo utilizado no pré e pós-dipping frente à Staphylococcus coagulase negativa (SCN). Foram estudados 53 isolados de SCN quanto à ação do desinfetante a 1,0% e suas diluições seriadas de 0,5%, 0,375% e 0,25%, além de duas apresentações comerciais nas concentrações de 0,5% e 0,25%. A taxa de inibição de SCN alcançada pelo iodo a 0,375%, 0,5% e 1,0% durante 60 segundos, foi de 60,4%. Em 30 segundos, o iodo a 0,5% e 1,0% apresentaram taxa de inibição microbiana de 52,8% e 56,6%, respectivamente. Os demais protocolos testados foram menos eficientes. Conclui-se que a maior atividade desinfetante in vitro para SCN foi demonstrada pelo iodo a 0,375%, 0,5% e 1,0%, durante 60 segundos. Testes de susceptibilidade microbiana devem ser realizados periodicamente, assim como práticas de educação em saúde e treinamentos corretivos na propriedade, visando garantir a saúde do úbere e o controle da mastite.

2.
Pesqui. vet. bras ; 37(7): 691-696, jul. 2017. tab, ilus, mapas
Article in Portuguese | LILACS, VETINDEX | ID: biblio-895474

ABSTRACT

A capacidade de produção de toxinas pelo Staphylococcus aureus no leite e produtos derivados está relacionado com surtos de intoxicação alimentar. Objetivou-se nesta pesquisa, estudar a ocorrência de genes que codificam para enterotoxinas estafilocócicas (sea, seb, sed, seg, seh e sei) e toxinas α e ß hemolítica (hla e hlb) em S. aureus isolados de 53 amostras de leite de tanques expansão comunitários no Estado de Alagoas, Brasil. Foram identificados 27 isolados (50,94%) como S. aureus pela amplificação do gene nuc. 13/27 isolados (48,1%) foram positivos para pelo menos um gene das enterotoxinas estudadas, sendo as frequências dos genes sea 33,3%, seh 18,5%, sei 11,1% e sed 7,4%; não entanto não foram identificados os genes seb e seg nestas bactérias. Para as toxinas hemolíticas, 51,9% dos isolados portavam ambos genes (hla e hlb), sendo a frequência para o gene hla de 81,5% e para o gene hlb de 51,9%. A frequência de genes das toxinas avaliadas é alta o que constitui um risco potencial para a saúde pública em especial, as enterotoxinas por serem termoestáveis e estarem asssociados com surtos de intoxicação alimentar.(AU)


The capacity of toxin production by Staphylococcus aureus in milk and dairy products is associated with food poisoning outbreaks. The objective of this research was to study the frequency of genes encoding staphylococcal enterotoxin (sea, seb, sed, seg, seh and sei) and α and ß hemolytic toxins (hla and hlb) in S. aureus isolates from 53 milk samples from community tanks in the State of Alagoas, Brazil. Twenty-seven isolates (50.94%) were identified as S. aureus by nuc gene amplification; 13/27 isolates (48.1%) were positive for at least one gene of the studied enterotoxins and the frequency of genes sea was 33.3%, seh 18.5%, sei 11.1% and sed 7.4%; the seb and sec genes have not been identified in the bacteria. For the hemolytic toxins, 51.9% of isolates harbored both genes (hla and hlb), the frequency of hla gene was 81.5% and 51.9% for the hlb gene. The evaluated toxin-encoding gene frequency is high and constitutes a potential risk for public health, especially staphylococcal enterotoxin genes; because they are heat-stable enterotoxins and have been associated with food poisoning.(AU)


Subject(s)
Staphylococcus aureus/genetics , Superantigens/genetics , Milk/microbiology , Enterotoxins , Polymerase Chain Reaction/veterinary
3.
Hig. Aliment. (Online) ; 29(244/245): 144-148, maio-jun. 2015. tab
Article in Portuguese | LILACS, VETINDEX | ID: biblio-1481794

ABSTRACT

Objetivou-se com este estudo avaliar a sensibilidade antimicrobiana in vitro das Enterobactérias isoladas em amostras de queijo coalho comercializado em Viçosa - AL. Foram analisadas seis amostras provenientes de feiras livre, mercados e padarias da cidade. No laboratório foram realizadas análises da ocorrência de coliformes fecais, e avaliado o perfil de sensibilidade dos micro-organismos encontrados. Foi utilizada a técnica do número mais provável de coliformes (NMP.g-1). Observou-se a presença de Enterobactérias em todas as amostras, e destas duas se encontravam acima do limite estabelecido pela legislação. Observou-se também um percentual de sensibilidade in vitro das enterobactérias estudadas, onde 100% foram sensíveis à Enrofloxacina e Gentamicina. Ocorreu resistência de 100% Enterobactérias a Amoxicilina e 83,3% a Sulfazotrim, e para Cefquinoma 66,6% responderam com sensibilidade parcial. Foi observado baixo índice de resistência múltipla aos antimicrobianos testados. Conclui-se que ocorreu sensibilidade e resistência aos antimicrobianos neste estudo, o perfil de resistência verificado é significante, além disso algumas amostras não se encontravam em conformidade com a legislação, oferecendo riscos à saúde do consumidor. Sugere-se o treinamento dos manipuladores para reduzir os riscos de DTA's.


The objective of this study to evaluate the in vitro antimicrobial susceptibility of Enterobacteria isolated from samples of curd cheese commercialized in Viçosa - AL. We analyzed six samples from free fairs, markets and bakeries in the city. In the laboratory were analyzed for the occurrence of fecal coliforms, and evaluated the sensitivity of microorganisms found. Technique was used most probable number of coliforms (NMP.g-1). We observed the presence of Enterobacteria in all samples, and these two were above the limit established by law. There was also a percentage of in vitro sensitivity of Enterobacteriaceae studied, where 100% were susceptible to Enrofloxacin and gentamicin. Resistance occurred in Enterobacteria 100% and 83.3% to amoxicillin Sulfazotrim, Cefquinome and 66.6% responded with partial sensitivity. We observed low rates of antimicrobial resistance qaos tested multiple hard. It is concluded that there was sensitivity and resistance to antimicrobials in this study, the resistance profile observed is significant, in addition some samples were not in accordance with the law, providing health risks to the consumer. It is suggested that the training of handlers to reduce the risk of DTA's.


Subject(s)
Food Contamination/analysis , Enterobacteriaceae , Drug Resistance, Bacterial , Cheese/microbiology , Brazil , Microbial Sensitivity Tests
4.
Bol. Centro Pesqui. Process. Aliment ; 31(01): 51-56, jan. 2013.
Article in English | LILACS | ID: biblio-982001

ABSTRACT

The present study aimed to evaluate the microbiological and physicochemical quality of curd cheese commercialized in Alagoas (BRAZIL). Thirty samples were collect during a fi ve months period in six points of sale. It was estimated the number of coagulase-positive Staphylococcus and coliforms, as well as the presence of Salmonella spp. and Listeria monocytogenes. Regarding physicochemical characteristics, pH, fat content and humidity were evaluated. Among the thirty analyzed samples, 20 (66.6%) were in accordance with Brazilian legislation parameters for coliforms, while 10 (33.3%) surpassed those limits. For coagulase-positive Staphylococcus 15 samples (50%) showed values above the allowed by legislation. None of the samples analyzed harbored Salmonella spp. or Listeria monocytogenes. Regarding physicochemical parameters, the average values observed were of 5.89 for pH, 23.6% for fat content and 46.96 g/100 g for humidity. Overall, the results obtained refl ect the poor hygienic conditions observed from manufacture to commercialization, pointing towards a potential health risk for curd cheese consumers. Furthermore is necessary to regulate physicochemical standards for curd cheese fabication.


Subject(s)
Food Hygiene , Chemical Phenomena , Microbiological Techniques , Cheese/microbiology , Risk Assessment , Food Analysis
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