Intestinal colonization resistance in the context of environmental, host, and microbial determinants

Microbial communities that colonize the human gastrointestinal (GI) tract defend against pathogens through a mechanism known as colonization resistance (CR). Advances in technologies such as next-generation sequencing, gnotobiotic mouse models, and bacterial cultivation have enhanced our understanding of the underlying mechanisms and the intricate microbial interactions involved in CR. Rather than being attributed to specific microbial clades, CR is now understood to arise from a dynamic interplay between microbes and the host and is shaped by metabolic, immune, and environmental factors. This evolving perspective underscores the significance of contextual factors, encompassing microbiome composition and host conditions, in determining CR. This review highlights recent research that has shifted its focus toward elucidating how these factors interact to either promote or impede enteric infections. It further discusses future research directions to unravel the complex relationship between host, microbiota, and environmental determinants in safeguarding against GI infections to promote human health

Importância da relação Escola/Família no processo de inclusão de crianças com paralisa cerebral em creche

Orientação: Nuno MateusEste estudo enquadra-se numa avaliação da importância da relação escola/família no processo de inclusão de crianças com Paralisia Cerebral em contexto de Creche. Além dos profissionais especializados contribuírem para o desenvolvimento de crianças com Paralisia Cerebral, a família assume um papel fulcral. A intervenção da família é assim essencial no processo de desenvolvimento/inclusão destas crianças ao longo da vida. Nesse sentido, destacamos como objetivos primordiais: identificar o envolvimento da família e as dinâmicas relacionais com vista ao desenvolvimento pessoal e social da criança, aferir as relações interpessoais dos técnicos e professores que lidam com a inclusão de crianças com PC, perceber a perspetiva que os terapeutas têm acerca da inclusão de crianças com PC, conhecer as conceções dos educadores/professores sobre inclusão, saber como a PC é integrada em Creche, identificar a ação dos pais e da escola na inclusão de uma criança com PC e identificar a articulação do educador/professor com os pais e vice-versa. Para a realização deste estudo, optou-se por utilizar uma metodologia de natureza qualitativa – estudo de caso. Realizaram-se entrevistas semiestruturadas aos intervenientes no processo de desenvolvimento da criança (pais, educadores/professores, terapeutas) para recolher dados. A informação obtida foi apurada mediante análise de conteúdo dessas mesmas entrevistas.This study was based on an assessment of the relative importance of school / family in the process of inclusion of children with Cerebral Palsy in context Creche. Besides professionals contribute to the development of children with Cerebral Palsy, the family plays a pivotal role. A family intervention is therefore essential in the development / inclusion of these children throughout their lives. In this sense, we highlight as primary objectives: to identify the involvement of family and relational dynamics with a view to personal and social development of the child, assess the interpersonal relationships of technicians and teachers who deal with the inclusion of children with CP, realize the perspective that therapists have about the inclusion of children with CP, meet the conceptions of educators / teachers about inclusion, how the PC is integrated Creche, identify the action of parents and school in the inclusion of a child with CP and identify joint educator / teacher with parents and vice versa. For this study, we chose to use a qualitative methodology - case study. Semi-structured interviews were conducted with stakeholders in the development process of the child (parents, educators / teachers, therapists) to collect data. The information obtained was determined by content analysis of those interviews

SARS-CoV-2 introductions and early dynamics of the epidemic in Portugal

Genomic surveillance of SARS-CoV-2 in Portugal was rapidly implemented by the National Institute of Health in the early stages of the COVID-19 epidemic, in collaboration with more than 50 laboratories distributed nationwide. Methods By applying recent phylodynamic models that allow integration of individual-based travel history, we reconstructed and characterized the spatio-temporal dynamics of SARSCoV-2 introductions and early dissemination in Portugal. Results We detected at least 277 independent SARS-CoV-2 introductions, mostly from European countries (namely the United Kingdom, Spain, France, Italy, and Switzerland), which were consistent with the countries with the highest connectivity with Portugal. Although most introductions were estimated to have occurred during early March 2020, it is likely that SARS-CoV-2 was silently circulating in Portugal throughout February, before the first cases were confirmed. Conclusions Here we conclude that the earlier implementation of measures could have minimized the number of introductions and subsequent virus expansion in Portugal. This study lays the foundation for genomic epidemiology of SARS-CoV-2 in Portugal, and highlights the need for systematic and geographically-representative genomic surveillance.We gratefully acknowledge to Sara Hill and Nuno Faria (University of Oxford) and Joshua Quick and Nick Loman (University of Birmingham) for kindly providing us with the initial sets of Artic Network primers for NGS; Rafael Mamede (MRamirez team, IMM, Lisbon) for developing and sharing a bioinformatics script for sequence curation (https://github.com/rfm-targa/BioinfUtils); Philippe Lemey (KU Leuven) for providing guidance on the implementation of the phylodynamic models; Joshua L. Cherry (National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health) for providing guidance with the subsampling strategies; and all authors, originating and submitting laboratories who have contributed genome data on GISAID (https://www.gisaid.org/) on which part of this research is based. The opinions expressed in this article are those of the authors and do not reflect the view of the National Institutes of Health, the Department of Health and Human Services, or the United States government. This study is co-funded by Fundação para a Ciência e Tecnologia and Agência de Investigação Clínica e Inovação Biomédica (234_596874175) on behalf of the Research 4 COVID-19 call. Some infrastructural resources used in this study come from the GenomePT project (POCI-01-0145-FEDER-022184), supported by COMPETE 2020 - Operational Programme for Competitiveness and Internationalisation (POCI), Lisboa Portugal Regional Operational Programme (Lisboa2020), Algarve Portugal Regional Operational Programme (CRESC Algarve2020), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF), and by Fundação para a Ciência e a Tecnologia (FCT).info:eu-repo/semantics/publishedVersio

Bacteriophages targeting protective commensals impair resistance against Salmonella Typhimurium infection in gnotobiotic mice.

Gut microbial communities protect the host against a variety of major human gastrointestinal pathogens. Bacteriophages (phages) are ubiquitous in nature and frequently ingested via food and drinking water. Moreover, they are an attractive tool for microbiome engineering due to the lack of known serious adverse effects on the host. However, the functional role of phages within the gastrointestinal microbiome remain poorly understood. Here, we investigated the effects of microbiota-directed phages on infection with the human enteric pathogen Salmonella enterica serovar Typhimurium (S. Tm), using a gnotobiotic mouse model (OMM14) for colonization resistance (CR). We show, that phage cocktails targeting Escherichia coli and Enterococcus faecalis acted in a strain-specific manner. They transiently reduced the population density of their respective target before establishing coexistence for up to 9 days. Infection susceptibility to S. Tm was markedly increased at an early time point after challenge with both phage cocktails. Surprisingly, OMM14 mice were also susceptible 7 days after a single phage inoculation, when the targeted bacterial populations were back to pre-phage administration density. Concluding, our work shows that phages that dynamically modulate the density of protective members of the gut microbiota can provide opportunities for invasion of bacterial pathogens, in particular at early time points after phage application. This suggests, that phages targeting protective members of the microbiota may increase the risk for Salmonella infection