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1.
Eur J Clin Microbiol Infect Dis ; 33(5): 845-51, 2014 May.
Artigo em Inglês | MEDLINE | ID: mdl-24292099

RESUMO

Iron acquisition is a virulence factor for Staphylococcus aureus. We assessed the efficacy of the iron chelator, deferasirox (Def), alone or in combination with vancomycin (Van) against two methicillin-resistant S. aureus (MRSA) strains in vitro and in a murine bacteremia model. In vitro time-kill assays were carried out against MRSA or vancomycin-intermediate S. aureus (VISA) strains. The impact of Def on Van binding to the surface of S. aureus was measured by flow cytometry. Furthermore, we compared the efficacy of Def, Van, or both drugs in treating S. aureus bacteremia in a murine model. Combination therapy reduced MRSA and VISA viability in vitro versus either drug alone or untreated controls (p < 0.005); this outcome was correlated with enhanced Van surface binding to S. aureus cells. In vivo, Def + Van combination therapy significantly reduced the bacterial burden in mice kidneys (p = 0.005) and spleen (p < 0.001), and reduced the severity of infection with MRSA or VISA strains compared to placebo-treated mice. Our results show that Def enhances the in vitro and in vivo capacity of Van-mediated MRSA killing via a mechanism that appears to involve increased binding of Van to the staphylococcal surface. Iron chelation is a promising, novel adjunctive therapeutic strategy for MRSA and VISA infections.


Assuntos
Antibacterianos/uso terapêutico , Bacteriemia/tratamento farmacológico , Benzoatos/uso terapêutico , Quelantes/uso terapêutico , Infecções Estafilocócicas/tratamento farmacológico , Triazóis/uso terapêutico , Vancomicina/uso terapêutico , Animais , Carga Bacteriana , Deferasirox , Modelos Animais de Doenças , Quimioterapia Combinada/métodos , Ferro/metabolismo , Rim/microbiologia , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Staphylococcus aureus Resistente à Meticilina/metabolismo , Camundongos Endogâmicos BALB C , Testes de Sensibilidade Microbiana , Viabilidade Microbiana/efeitos dos fármacos , Índice de Gravidade de Doença , Baço/microbiologia , Resultado do Tratamento
2.
Public Health Action ; 12(4): 191-194, 2022 Dec 21.
Artigo em Inglês | MEDLINE | ID: mdl-36561907

RESUMO

COVID-19, the novel coronavirus, has posed a major threat to low- and middle-income countries (LMICs) due to inadequate health infrastructure and human resources. Ethiopia, a low-income country with the second largest population in Africa, has coordinated a strategic response, leveraging existing infrastructure and health systems and mobilizing public health professionals and specialist expert physicians for a multifaceted, unified government approach and adaptive response. Resource limitations, particularly in critical care, have still posed challenges, but the public health and clinical interventions thus far have prevented the catastrophic toll that many predicted. As the pandemic continues, Ethiopia expects to use a triple care model integrated at all levels, consisting of COVID-19 care, isolation care for suspected cases, and essential health services, and urges intensified non-pharmaceutical interventions alongside equitable global vaccine distribution as the ultimate answers to pandemic control. This paper draws on existing data, national planning and guidelines, and expertise from health leadership to describe this response in hopes of providing an example of how future large-scale health challenges might be faced in LMICs, using Ethiopia's successes and challenges in facing the pandemic.


COVID-19, le nouveau coronavirus, a représenté une menace majeure pour les pays à revenu faible et intermédiaire (LMIC) en raison de l'insuffisance des infrastructures de santé et des ressources humaines. L'Éthiopie, un pays à faible revenu dont la population est la deuxième plus importante d'Afrique, a coordonné une réponse stratégique, en tirant parti des infrastructures et des systèmes de santé existants et en mobilisant des professionnels de la santé publique et des médecins experts spécialisés pour une approche gouvernementale unifiée à multiples facettes et une réponse adaptative. Les ressources limitées, notamment en matière de soins intensifs, ont encore posé des problèmes, mais les interventions cliniques et de santé publique menées jusqu'à présent ont permis d'éviter le bilan catastrophique que beaucoup prédisaient. Alors que la pandémie se poursuit, l'Éthiopie prévoit d'utiliser un modèle de soins triple intégré à tous les niveaux, composé de soins COVID-19, de soins d'isolement pour les cas suspects et de services de santé essentiels, et préconise l'intensification des interventions non pharmaceutiques parallèlement à une distribution équitable des vaccins à l'échelle mondiale comme réponses ultimes au contrôle de la pandémie. Cet article s'appuie sur les données existantes, la planification et les directives nationales, et l'expertise des responsables de la santé pour décrire cette réponse dans l'espoir de fournir un exemple de la manière dont les futurs défis sanitaires à grande échelle pourraient être relevés dans les LMIC, en utilisant les succès et les défis de l'Éthiopie face à la pandémie.

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