GHTM

Global Health and Tropical Medicine

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Home / Archives for Viveiros M

Genetic diversity and molecular epidemiology of mycobacterium tuberculosis in Roraima State, Brazil

  • Autores: Tatara MB, Perdigão J, Viveiros M, Kritski A, Silva KED, Sacchi FPC, de Lima CC, Dos Santos PCP, Diniz JLDCG, Almeida Silva PE, Gomes P, Gomes MMQ, Cunha EAT, Lapa e Silva JR, Portugal I, Croda J, Andrade MKN
  • Ano de Publicação: 2019
  • Journal: The American Journal of Tropical Medicine and Hygiene
  • Link: https://www.ncbi.nlm.nih.gov/pubmed/31392954

National border areas are special places for the spread of Mycobacterium tuberculosis (MTB). These regions concentrate vulnerable populations and constant population movements. Understanding the dynamics of the transmission of MTB is fundamental to propose control measures and to monitor drug resistance. We conducted a population-based prospective study of tuberculosis (TB) to evaluate molecular characteristics of MTB isolates […]
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The contribution of efflux pumps in mycobacterium abscessus complex resistance to clarithromycin

  • Autores: Vianna JS, Machado D, Ramis IB, Silva FP, Bierhals DV, Abril MA, von Groll A, Ramos DF, Lourenço MCS, Viveiros M, da Silva PEA
  • Ano de Publicação: 2019
  • Journal: Antibiotics
  • Link: https://www.ncbi.nlm.nih.gov/pubmed/31540480

The basis of drug resistance in Mycobacterium abscessus is still poorly understood. Nevertheless, as seen in other microorganisms, the efflux of antimicrobials may also play a role in M. abscessus drug resistance. Here, we investigated the role of efflux pumps in clarithromycin resistance using nine clinical isolates of M. abscessus complex belonging to the T28 erm(41) sequevar responsible for the inducible resistance […]
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Experimental Evidence for Limited in vivo Virulence of Mycobacterium africanum

  • Autores: Cá B, Fonseca KL, Sousa J, Maceiras AR, Machado D, Sanca L, Rabna P, Rodrigues PNS, Viveiros M, Saraiva M
  • Ano de Publicação: 2019
  • Journal: Frontiers in Microbiology
  • Link: https://www.ncbi.nlm.nih.gov/pubmed/31552007

Tuberculosis remains a public health problem and a main cause of death to humans. Both Mycobacterium tuberculosis and Mycobacterium africanum cause tuberculosis. In contrast to M. tuberculosis, which is geographically spread, M. africanum is restricted to West Africa. Differences have also been found in the growth rate and type of disease caused by M. africanum, globally suggesting an attenuation of this bacteria. In […]
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Mycobacterium marinum lymphocutaneous infection

  • Autores: Bouceiro-Mendes R, Ortins-Pina A, Fraga A, Marques T, Viveiros M, Machado D, Soares-de-Almeida L, Freitas JP, Filipe P
  • Ano de Publicação: 2019
  • Journal: Dermatology Online Journal
  • Link: https://www.ncbi.nlm.nih.gov/pubmed/30865411

Mycobacterium marinum is a nontuberculous mycobacteria with worldwide distribution that lives in fresh or salt water and is responsible for infections in fish, and sometimes in humans. Human disease consists mainly of cutaneous nodules, but deep structure involvement may also occur. Diagnosis of M. marinum infection remains a challenge, with a considerable time delay between […]
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A case report of disseminated Mycobacterium colombiense infection in an HIV patient

  • Autores: Pena E, Machado D, Viveiros M, Jordão S
  • Ano de Publicação: 2019
  • Journal: International Journal of Mycobacteriology
  • Link: https://www.ncbi.nlm.nih.gov/pubmed/31512608

Mycobacterium colombiense is a newly recognized member of the Mycobacterium avium complex, and only a few cases of infections caused by this pathogen have been reported. We present an imported case of disseminated disease caused by M. colombiense in an HIV patient in early February 2017.
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About GHTM

GHTM is a R&D Center that brings together researchers from IHMT with a track record in Tropical Medicine and International/Global Health. It aims at strengthening Portugal's role as a leading partner in the development and implementation of a global health research agenda. Our evidence-based interventions contribute to the promotion of equity in health and to improve the health of populations.

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+351 213 652 600
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