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Detection of genes associated with resistance to nalidixic acid and ciprofloxacin reduced susceptibility of Salmonella spp. strains isolated in the state of São Paulo

Grant number: 15/01287-7
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): May 01, 2015
Effective date (End): April 30, 2016
Field of knowledge:Biological Sciences - Microbiology - Applied Microbiology
Principal Investigator:Monique Ribeiro Tiba Casas
Grantee:Jordana Maria da Silva
Host Institution: Instituto Adolfo Lutz (IAL). Coordenadoria de Controle de Doenças (CCD). Secretaria da Saúde (São Paulo - Estado). São Paulo , SP, Brazil


Salmonella spp are the most frequent causative agents of foodborne disease. Clinical manifestations of human infections with Salmonella spp. cause from mild to severe gastroenteritis intestinal and extra-intestinal infections such as bacteremia, sepsis and meningitis, including typhoid fever. Antimicrobial therapy is essential for immunocompromised patients, the elderly or children, or in severe cases or invasive caused by Salmonella, and ciprofloxacin (fluorquinolone) is recommended as the drug of first choice for treatment. The resistance to fluorquinolones is still rare in Salmonella spp. However, in recent decades the emergence and spread of resistance to nalidixic acid (quinolone first generation) associated with reduced susceptibility to ciprofloxacin among Salmonella serotypes, it has become of great interest public health, interfering directly in response to clinical treatment. The multidrug resistance in Salmonella has been increased due to the indiscriminate use of antimicrobial agents in the treatment and prophylaxis human and veterinary medicine. In this paper we will study 92 Salmonella strains exhibiting resistance to nalidixic acid and reduced susceptibility to ciprofloxacin, cases of human infections and non-human origin (mostly food), isolated in the state of São Paulo. The aim of this study is to detect and identify plasmid genes mediating acquired resistance to quinolones (PMQR. For this techniques will be used phenotypic and genotypic typing as serotyping, antimicrobial susceptibility testing, polymerase chain reaction. The results contribute to knowledge about the molecular mechanisms of resistance to fluorquinolones among Salmonella strains widespread in our region, warning of the indiscriminate use of fluorquinolones in human and veterinary medicine, to reduce the selection pressure and prevent the emergence of resistant clones.

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