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Global Health and Tropical Medicine

Home / Archives for Miguel Viveiros

Whole-genome sequencing as a tool for studying the microevolution of drug-resistant serial Mycobacterium tuberculosis isolates

ABSTRACT Treatment of drug-resistant tuberculosis requires extended use of more toxic and less effective drugs and may result in retreatment cases due to failure, abandonment or disease recurrence. It is therefore important to understand the evolutionary process of drug resistance in Mycobacterium tuberculosis. We here in describe the microevolution of drug resistance in serial isolates from six previously […]
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HIV and Tuberculosis Co-Infection Among Migrants in Portugal: A Brief Study on Their Sociodemographic, Clinical, and Genomic Characteristics

SHORT COMMUNICATION ABSTRACT HIV and tuberculosis (TB) are among the global deadliest diseases. Migrant populations are particularly vulnerable to these infections. Yet, literature is still scarce on the epidemiology of HIV–TB co-infection among migrants. In this study, we characterized native and migrant HIV patients followed in Portuguese hospitals, who were diagnosed with TB, regarding their […]
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Multicentre testing of the EUCAST broth microdilution reference method for MIC determination on Mycobacterium tuberculosis

ABSTRACT ‘Objectives:’ The first objective of the European Committee on Antimicrobial Susceptibility Testing (EUCAST) subcommittee for antimycobacterial susceptibility testing (AMST), launched in 2016, was to set a reference method for determining the MICs of antituberculous agents, since many protocols are used worldwide and a consensus one is needed for the determination of microbiological breakpoints. ‘Methods:’ […]
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Genomic-based surveillance reveals high ongoing transmission of multi-drug-resistant Mycobacterium tuberculosis in Southern Brazil

HIGHLIGHTS • Disputed mutations were found in 21.9% of strains resistant to isoniazid alone, evidencing underestimation of multi-drug resistance. • 73.4% of multi-drug-resistant cases were linked to ongoing transmission events. • Intracluster acquisition of novel drug-resistance mutations was found, revealing important amplification of resistance. ABSTRACT Genomic-based surveillance on the occurrence of drug resistance and its […]
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Genetic diversity of candidate loci linked to Mycobacterium tuberculosis resistance to bedaquiline, delamanid and pretomanid

ABSTRACT Tuberculosis (TB), caused by Mycobacterium tuberculosis, is one of the deadliest infectious diseases worldwide. Multidrug and extensively drug‑resistant strains are making disease control difficult, and exhausting treatment options. New anti‑TB drugs bedaquiline (BDQ), delamanid (DLM) and pretomanid (PTM) have been approved for the treatment of multi‑drug resistant TB, but there is increasing resistance to […]
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About GHTM

GHTM is a R&D Unit that brings together researchers 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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