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  • Title: Is community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) an emerging pathogen among children in Brazil?
    Author: Paternina-de la Ossa R, Prado SID, Cervi MC, Lima DAFDS, Martinez R, Bellissimo-Rodrigues F.
    Journal: Braz J Infect Dis; 2018; 22(5):371-376. PubMed ID: 30389351.
    Abstract:
    BACKGROUND: Community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) is spreading worldwide, but little is known about the epidemiology of this pathogen in Brazil. OBJECTIVE: To evaluate clinical and microbiological features of children with S. aureus infections admitted to a university hospital. METHODS: This was a cross-sectional study evaluating the potential risk factors for CA-MRSA, and a retrospective cohort evaluating in-hospital clinical outcomes. To include patients with both community and hospital-associated infections, we screened the results of the microbiological laboratory tests from January 1, 2012, to December 31, 2016. According to the phenotype, we classified the isolates in Methicillin-Susceptible S. aureus (MSSA), Hospital-Associated Methicillin-Resistant S. aureus (HA-MRSA), and CA-MRSA. Clinical data were collected from the patients' medical records. RESULTS: We identified 279 cases of S. aureus infections (MSSA=163, CA-MRSA=69, HA-MRSA=41). Overall, the incidence density of CA-MRSA and MSSA infections increased while the HA-MRSA incidence density decreased over the study period. CA-MRSA infected patients were more likely to present with skin and soft tissue infections (OR: 2.83, 95%CI: 1.54-5.33, p<0.001) and osteomyelitis (OR: 4.76; 95%CI: 1.16-22.71, p=0.014) when compared to MSSA and HA-MRSA infections. Unadjusted case fatality rates were similar between MSSA-infected patients (3.14%, 5/159) and CA-MRSA infected patients (3.80%, 3/79, p=0.792), while HA-MRSA infected patients were more likely to die in the hospital (12.20%, 5/41, p=0.013). CONCLUSIONS: CA-MRSA is an emergent pediatric pathogen in Brazil. Our results highlight the relevance of choosing an appropriate initial antimicrobial drug for treating children with severe S. aureus infections.
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