Oxacillinase detection in clinical isolates of carbapenem-resistant Acinetobacter baumannii from the State of São Paulo, Brazil

• Grant number: 14/11380-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: September 01, 2014
• End date: August 31, 2015
• Field of knowledge: Biological Sciences - Genetics - Molecular Genetics and Genetics of Microorganisms
• Principal Investigator: Carlos Henrique Camargo
• Grantee: Marta Regina Saes
• Host Institution: Instituto Adolfo Lutz (IAL). Coordenadoria de Controle de Doenças (CCD). Secretaria da Saúde (São Paulo - Estado). São Paulo , SP, Brazil

Abstract

Healthcare associated infections lead to increase of morbity and mortality, and can reflect in the costs of patients' management. Acinetobacter species, particularly Acinetobacter baumannii is associated with several kinds of nosocomial infections, and represent an important treat to infection control. They possess a large number of resistance mechanisms against virtually all available antimicrobial agents, including the carbapenems, which had been the longstanding last-line agents for treating Acinetobacter infections. A global increase in carbapenem-resistant Acinetobacter has been reported. The main mechanism associated with carbapenem resistance is the beta-lactamase production of OXA enzymes. The main variants of oxacillinases are those included in the groups OXA-23, OXA-51, OXA-24/40, OXA-58 and OXA-143. So far, there is any phenotipic test able to specifically detect the presence of oxacillinases, leading to the use of molecular techniques, such as the polymerase chain reaction, which presents high sensitivity and specificty. To determine the oxacillinase present in carbapenem-resistant A. baumannii can contribute for understanding the epidemiology of circulating strains. Thus, the aim of this study is to evaluate the presence of the oxacillinases encoding genes OXA-23, OXA-51, OXA-24/40, OXA-58 and OXA-143 groups in A. baumannii strains isolated from clinical specimens of hospitalized patients across the State of São Paulo, Brazil.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

CAMARGO, CARLOS HENRIQUE; TIBA, MONIQUE RIBEIRO; SAES, MARTA REGINA; DE VASCONCELLOS, FRANCIELLI MAHNIC; DOS SANTOS, LUIS FERNANDO; ROMERO, ELIETE CALO; GARCIA, DOROTI DE OLIVEIRA. Population Structure Analysis of Carbapenem-Resistant Acinetobacter baumannii Clinical Isolates from Brazil Reveals Predominance of Clonal Complexes 1, 15, and 79. Antimicrobial Agents and Chemotherapy, v. 60, n. 4, p. 2545-2547, APR 2016. (13/12055-4, 14/11380-1)