Genetic and Phenotypic Changes Related to the Development of -Independent Oxacillin Non-Susceptibility in ST8 Recovered after Antibiotic Therapy in a Patient with Bacteremia.

The -independent oxacillin non-susceptible (MIONSA) strains represent a great clinical challenge, as they are not easily detected and can lead to treatment failure. However, the responsible molecular mechanisms are still very little understood. Here, we studied four clinical ST8-MSSA- isolates recovered during the course of antibiotic treatment from a patient suffering successive episodes of bacteremia.

Outbreak of Klebsiella pneumoniae ST11 Resistant To Ceftazidime-Avibactam Producing KPC-31 and the Novel Variant KPC-115 during COVID-19 Pandemic in Argentina.

We describe an outbreak of Klebsiella pneumoniae sequence type 11 (ST11) producing KPC variants resistant to ceftazidime-avibactam. Six patients hospitalized in the intensive care unit (mostly due to critical COVID pneumonia) presented infection or colonization by this bacterium. They had several comorbidities and required mechanical ventilation, central venous catheters, and urinary catheters.

[Incidence, clinical characteristic and evolution of Clostridioides difficile infection].

Clostridioides difficile infection (CDi) is one of the foremost hospital-acquired infections. We present an observational study aimed to describe the incidence, epidemiology, and clinical outcome of CDi in a tertiary university hospital in Buenos Aires. The episodes, diagnosed in 117 consecutive adult patients in the period 01/01/2017 to 01/04/2020, were distributed in three groups: 63 (53.

[In vitro activity of delafloxacin against bacterial isolates from osteoarticular and skin infections in Buenos Aires, Argentina].

In vitro activities of delafloxacin, ciprofloxacin and levofloxacin were evaluated by epsilometric and disk diffusion methods against 181 bacterial isolates recovered from bone and skin infections. Isolates included were 84 Staphylococcus aureus (40 MRSA and 44 MSSA), 46 coagulase-negative staphylococci (CNS), 23 Klebsiella pneumoniae and 28 Pseudomonas aeruginosa. The MIC/MIC (mg/l) for delafloxacin, ciprofloxacin and levofloxacin, respectively, were: MRSA, 0.

Results from the Survey of Antibiotic Resistance (SOAR) 2015-17 in Latin America (Argentina, Chile and Costa Rica): data based on CLSI, EUCAST (dose-specific) and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints.

Objectives: To determine antibiotic susceptibility of Streptococcus pneumoniae and Haemophilus influenzae isolates from community-acquired respiratory tract infections (CA-RTIs) collected in 2015-17 from Argentina, Chile and Costa Rica.

Methods: MICs were determined by CLSI broth microdilution and susceptibility was assessed using CLSI, EUCAST (dose-specific) and pharmacokinetic/pharmacodynamic (PK/PD) breakpoints.

Results: A total of 170 S.