Abstract INTRODUCTION: In this study, we report a clonal dissemination of carbapenem resistant Acinetobacter baumannii isolates due to the acquisition of blaOXA-23 in a regional hospital located in Brazilian Amazon Region. METHODS: The isolates were identified by MALDI-TOF and the carbapenemase-encoding genes were detected by multiplex-PCR. The genetic similarity was investigated by pulsed-field gel electrophoresis (PFGE). RESULTS: Only 10 (55.6%) isolates harbored the gene bla OXA-23. PFGE analysis revealed that these isolates belong to a single clone. CONCLUSIONS: This dissemination strategy indicates the need for surveillance, adoption of control procedures defined in guidelines, and the careful administration of antimicrobials should be reinforced.

O artigo apresenta a análise das interações discursivas ocorridas no plano coletivo de uma aula de História, realizada numa turma de 1o ano do Segundo Ciclo, no contexto de uma pesquisa-ação, que visou à construção do conceito de migração pelos alunos. Tomou-se como suposto teórico que a construção e apropriação de conhecimentos históricos pelos alunos não se processam diretamente entre o sujeito e o objeto a ser conhecido. Entre esses existe o papel mediador dos conceitos históricos e da ação mediada do professor e dos meios mediacionais, ou seja, da linguagem, de signos e ferramentas, na sua construção pelos alunos.

The paper presents the analysis of discursive interactions happening in collective level in a 3rd grade History class, under the context of an action research, aimed at the construction of the concept of migration by the students. The theoretical assumption was that the construction and appropriation of historic knowledge by them are not directly processed between the subject and the object to be known. Between them there is the mediator role of historic concepts and the mediated action of the teacher and the mediational means, that is, language, signs, and tools, in its construction by the students.