Browsing by Author "Alves, J"
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- Chlamydia Trachomatis: When the Virulence-Associated Genome Backbone Imports a Prevalence-Associated Major Antigen SignaturePublication . Borges, V; Cordeiro, D; Salas, AI; Lodhia, Z; Correia, C; Isidro, J; Fernandes, C; Rodrigues, AM; Azevedo, J; Alves, J; Roxo, J; Rocha, M; Côrte-Real, R; Vieira, L; Borrego, MJ; Gomes, JPChlamydia trachomatis is the most prevalent sexually transmitted bacterium worldwide and the causative agent of trachoma. Its strains are classified according to their ompA genotypes, which are strongly linked to differential tissue tropism and disease outcomes [ocular disease, urogenital disease and lymphogranuloma venereum (LGV)]. While the genome-based species phylogenetic tree presents four main clades correlating with tropism/prevalence, namely ocular, LGV, urogenital T1 (more prevalent genotypes) and urogenital T2 (less prevalent genotypes), inter-clade exchange of ompA is considered a rare phenomenon probably mediating marked tropism alterations. An LGV epidemic, associated with the clonal expansion of the L2b genotype, has emerged in the last few decades, raising concerns particularly due to its atypical clinical presentation (ulcerative proctitis) and circulation among men who have sex with men (MSM). Here, we report an LGV outbreak, mostly affecting human immunodeficiency virus-positive MSM engaging in high-risk sexual practices, caused by an L2b strain with a rather unique non-LGV ompA signature that precluded the laboratory notification of this outbreak as LGV. C. trachomatis whole-genome capture and sequencing directly from clinical samples was applied to deeply characterize the genomic backbone of this novel LGV outbreak-causing clone. It revealed a chimeric genome structure due to the genetic transfer of ompA and four neighbouring genes from a serovar D/Da strain, likely possessing the genomic backbone associated with the more prevalent urogenital genotypes (T1 clade), to an LGV (L2b) strain. The hybrid L2b/D-Da strain presents the adhesin and immunodominant antigen MOMP (major outer membrane protein) (encoded by ompA) with an epitope repertoire typical of non-invasive genital strains, while keeping the genome-dispersed virulence fingerprint of a classical LGV strain. As previously reported for inter-clade ompA exchange among non-LGV clades, this novel C. trachomatis genomic mosaic involving a contemporary epidemiologically and clinically relevant LGV strain may have implications on its transmission, tissue tropism and pathogenic capabilities. The emergence of variants with epidemic and pathogenic potential highlights the need for more focused surveillance strategies to capture C. trachomatis evolution in action.
- Como Retomar a Atividade Cirúrgica Eletiva em Ortopedia Durante a Pandemia COVID-19?Publication . Diogo, N; Miranda, A; Ruano, A; Mendes, E; Mendes, F; Montes, J; Alves, J; Rosa, I; Alegrete, N; Neves, N; Lourenço, P; Felicíssimo, P; Sá Cardoso, P; Gomes, AEste documento foi elaborado pelo Colégio de Ortopedia da Ordem dos Médicos com o objetivo de estabelecer as orientações sobre a retoma da atividade cirúrgica programada em Ortopedia durante a pandemia COVID-19. As presentes normas de orientação: a) definem os critérios que permitem a priorização das cirurgias de acordo com a gravidade da situação clínica, com base em classificações existentes e publicadas; b) fornecem um modelo de organização para a preparação dos doentes, descrevendo os circuitos do doente nos períodos pré-operatório, intraoperatório e pós-operatório; c) realçam as regras de segurança para a realização de cirurgias e desenham um modelo de acompanhamento após a alta de acordo com a evidência científica.
- A Metrologia na Saúde. Guia de Boas Práticas - Parte IIPublication . Ferreira, MC; Silveira, A; Carvalho, D; Figueira, F; Infante, J; Rodrigues, JM; Alves, J; Gomes, MA; Duarte, N; Pellegrino, O; Moutinho, S; Ramos, S
- A Metrologia na Saúde. Guia de Boas Práticas - Parte IIPublication . Ferreira, MC; Silveira, A; Carvalho, D; Figueira, F; Infante, J; Rodrigues, JM; Alves, J; Gomes, MA; Duarte, N; Pellegrino, O; Moutinho, S; Ramos, S
- Personality, Brain Asymmetry, and Neuroendocrine Reactivity in Two Immune-Mediated Disorders: a Preliminary ReportPublication . Martin Martins, J; Alves, J; Trinca, A; Grima, B; Vale, S; Vasconcelos, T; Riso, N; Vaz Riscado, M; Charneco da Costa, JDevelopment of some immune-mediated disorders may depend on dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis. To explore neuropsychologic mechanisms in relation to the abnormal endocrine reactivity in patients with systemic lupus erythematosus (SLE) and chronic hepatitis C (CHC) we used the corticotropin releasing hormone (CRH) test, the Minnesota Multiphasic Personality Inventory (MMPI), and the Edinburgh Inventory of Manual Preference Inventory (EIMP). Compared to controls, the adrenocorticotrophic hormone (ACTH) response to CRH was reduced in CHC, while SLE presented reduced baseline dehydroepiandrosterone sulfate levels; higher neurotic scores were found in SLE and higher behavior deviant scores in CHC. Peak ACTH levels were a significant factor for the MMPI profile variability, while the manual preference score was a significant factor for the ACTH response. Personality and manual preference contribute to neuroendocrine abnormalities. Different behavioral and neuroimmunoendocrine models emerge for these disorders.
- Recomendações para o Diagnóstico e Tratamento da Infeção Não Complicada por Chlamydia trachomatis (Não- Linfogranuloma Venéreo) em PortugalPublication . Andrade, P; Azevedo, J; Lisboa, C; Fernandes, C; Borrego, MJ; Borges-Costa, J; Reis, J; Santiago, F; Santos, A; Alves, JChlamydia trachomatis infection is the most prevalent sexually transmitted bacterial infection in the world. Being associated with a large number of asymptomatic carriers, the diagnosis is frequently challenging and requires appropriate laboratory testing. In Portugal, the incidence of the disease has been consistently increasing in recent years, meaning that special awareness is required for case identification, contact tracing and application of appropriate treatments. These recommendations result from the adaptation of the international consensuses on the diagnosis and treatment of Chlamydia trachomatis infection to the Portuguese healthcare setting, with the aim of standardizing the clinical and laboratory approach to symptomatic and nonsymptomatic carriers of the disease.