Change in Klebsiella pneumoniae susceptibility profile after the arrival of ceftazidime-avibactam in an Argentinean intensive care unit: a new ecological landscape.

Objective: Ceftazidime-avibactam (CZA) is a good option for Gram-negative bacilli infections that produce carbapenemase Classes A (especially blaKPC) and D (blaOXA). However, it is unknown whether it would have an impact on metallo-β-lactamases (blaMBL) selection. The aim of the study was to compare carbapenem and CZA Klebsiella pneumoniae (KPN) susceptibility profiles for a period of two years following the introduction of CZA.

[First isolation in Argentina of community-acquired methicillin-resistant Staphylococcus aureus with intermediate susceptibility to vancomycin and nonsusceptibility to daptomycin].

Unlabelled: We report the first case in Argentina of community-acquired methicillin-resistant Staphylococcus aureus with intermediate susceptibility to vancomycin and nonsusceptibility to daptomycin.

Case Report: A male patient with a history of chronic renal failure on hemodialysis and hip fracture osteosynthesis was admitted to hospital for persistent febrile syndrome following the displacement of the prosthesis by trauma. Blood cultures grew community-acquired methicillin-resistant Staphylococcus aureus.

[CHROMagar KPC. Comparison with the method proposed by the Centers for Disease Control and Prevention (CDC, USA) for rectal screening and evaluation of false positive results].

Eighty one rectal swabs (RS) were cultured on CHROMagar KPC and the CDC method. Of the 81 samples, 9 were positive for KPC-producing Klebsiella pneumoniae on CHROMagar KPC, and 6 for the CDC method. CHROMagar KPC had two false positive (FP) results: 1 K.

[Prevalence of methicillin resistant Staphylococcus aureus in skin and soft tissue infections, in ambulatory patients].

Unlabelled: An increased prevalence of community-acquired methicillin resistant Staphylococcus aureus (MRSA) in skin and soft tissue infections (SSTI) has been recently reported. Epidemiological data in Argentina is limited. Our objectives were to evaluate etiological agents, clinical presentation, risk factors and evolution of SSTI in ambulatory patients, in a descriptive and prospective study that was performed at the Infectious Diseases Department, Hospital Fernández, City of Buenos Aires, Argentina, from 10/01/2009 to 01/31/2011.