Publications by authors named "Bernard Landry"

Article Synopsis
  • - This study focuses on clarifying the taxonomy of specific species within the Hübner (Pyraloidea, Crambinae) by analyzing DNA barcodes to understand their evolutionary relationships and geographical distributions.
  • - An innovative DNA hybridization capture protocol was used to recover and compare DNA from type specimens, confirming several synonymies and establishing the identity of a species originally described by Fabricius in 1794.
  • - The research also involved collecting specimens across North and South America and resulted in improved methods for extracting DNA barcodes from historical specimens, advancing the study of Lepidoptera taxonomy.
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CADORmed is a free bespoke Excel® tool for committed effective dose assessment using latest dose coefficients from ICRP OIR publications. The field of application of CADORmed is special monitoring, and it is not available for the dose assessment of chronic exposure. Calculations are made according to EURADOS guidelines and principles (EURADOS report 2013-1).

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Gracillariidae leaf miners include 1987 species of poorly studied micromoths for which the majority of the diversity has been described from temperate regions. The Neotropics harbors one of the richest faunas of Gracillariidae, but the rate of taxon descriptions has been slow because of limited sampling and taxonomic activity. In this illustrated catalogue, we provide, for the first time, 476 high resolution illustrations for the 201 species of named gracillariids occurring in the region and revise their classification, newly considering the family-group names Oecophyllembiini stat.

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Immune activation is associated with increased risk of tuberculosis (TB) disease in infants. We performed a case-control analysis to identify drivers of immune activation and disease risk. Among 49 infants who developed TB disease over the first 2 years of life, and 129 healthy matched controls, we found the cytomegalovirus-stimulated (CMV-stimulated) IFN-γ response to be associated with CD8+ T cell activation (Spearman's rho, P = 6 × 10-8).

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Background: Recent Mycobacterium tuberculosis infection confers a predisposition to the development of tuberculosis disease, the leading killer among global infectious diseases. H4:IC31, a candidate subunit vaccine, has shown protection against tuberculosis disease in preclinical models, and observational studies have indicated that primary bacille Calmette-Guérin (BCG) vaccination may offer partial protection against infection.

Methods: In this phase 2 trial, we randomly assigned 990 adolescents in a high-risk setting who had undergone neonatal BCG vaccination to receive the H4:IC31 vaccine, BCG revaccination, or placebo.

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Background: Development of a tuberculosis vaccine to boost BCG is a major international health priority. SRL172, an inactivated whole cell booster derived from a non-tuberculous mycobacterium, is the only new vaccine against tuberculosis to have demonstrated efficacy in a Phase 3 trial. In the present study we sought to determine if a three-dose series of DAR-901 manufactured from the SRL172 master cell bank by a new, scalable method was safe and immunogenic.

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Background: The value of quantitative interferon-γ release assay results for predicting progression from Mycobacterium tuberculosis infection to active disease is unknown. We aimed to investigate the relation between QuantiFERON-TB Gold In-Tube (QFT) conversion interferon-γ values and risk of subsequent active tuberculosis disease and of QFT reversion.

Methods: We analysed data from a reported vaccine efficacy trial of the tuberculosis vaccine MVA85A in South Africa.

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Vaccines to protect against tuberculosis (TB) are urgently needed. We performed a case-control analysis to identify immune correlates of TB disease risk in Bacille Calmette-Guerin (BCG) immunized infants from the MVA85A efficacy trial. Among 53 TB case infants and 205 matched controls, the frequency of activated HLA-DR(+) CD4(+) T cells associates with increased TB disease risk (OR=1.

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Background: MVA85A and AERAS-402 are two clinically advanced viral vectored TB vaccine candidates expressing Mycobacterium tuberculosis antigens designed to boost BCG-induced immunity. Clinical trials with candidate malaria vaccines have demonstrated that adenoviral vector based priming immunisation, followed by MVA vector boost, induced high levels of immunity. We present the safety and immunogenicity results of the first clinical trial to evaluate this immunisation strategy in TB.

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Background: The risk of developing tuberculosis (TB) disease in HIV-uninfected children after isoniazid preventive therapy (IPT) for a positive QuantiFERON-TB Gold In-Tube test (QFT-GIT) is unknown. The aim of this study was to evaluate risk of TB disease after IPT in young HIV-uninfected children with a positive QFT-GIT result, or household TB contact.

Methods: HIV-uninfected South African infants aged 4-6 months were screened for enrolment in a TB vaccine trial.

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Background: Childhood tuberculosis (TB) is usually Mycobacterium tuberculosis (MTB) culture negative. Furthermore, clinical presentation may be altered by active case finding, isoniazid prophylaxis and early treatment. We aimed to establish the value of presenting symptoms for intrathoracic TB case diagnosis among young children.

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Background: HIV-1 infection is associated with increased risk of tuberculosis and a safe and effective vaccine would assist control measures. We assessed the safety, immunogenicity, and efficacy of a candidate tuberculosis vaccine, modified vaccinia virus Ankara expressing antigen 85A (MVA85A), in adults infected with HIV-1.

Methods: We did a randomised, double-blind, placebo-controlled, phase 2 trial of MVA85A in adults infected with HIV-1, at two clinical sites, in Cape Town, South Africa and Dakar, Senegal.

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Background: The safety and immunogenicity of a replication deficient adenovirus serotype 35 tuberculosis (TB) vaccine containing gene inserts for Antigens (Ag) 85A, Ag85B and TB10.4 (AERAS-402/AD35.TB-S) was evaluated in previously BCG vaccinated, HIV-infected South African adults with baseline CD4 counts >350 cells/mm(3).

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Article Synopsis
  • The genus Catharylla, originally described in 1863, has been revised with some species reassigned to the Argyria genus, while two species, C. paulella and C. tenellus, are redefined.
  • Six new species have been identified and added to the genus, with detailed phylogenetic analyses revealing their relationships based on both morphological features and molecular data.
  • The research also highlighted distinct species groups within Catharylla and outlined their geographic distributions, noting significant genetic divergence in several species through COI barcode sequences.
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Background: New tuberculosis (TB) vaccines are being developed to combat the global epidemic. A phase IIb trial of a candidate vaccine, MVA85A, was conducted in a high burden setting in South Africa to evaluate proof-of-concept efficacy for prevention of TB in infants.

Objective: To describe the study design and implementation lessons from an infant TB vaccine efficacy trial.

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Article Synopsis
  • A new vaccine, MVA85A, was developed to improve protection against tuberculosis in infants who have received the BCG vaccine; this study aimed to evaluate its safety, immune response, and effectiveness.
  • The trial involved 2,797 healthy infants aged 4-6 months in South Africa, randomly assigned to receive either MVA85A or a placebo, with active follow-ups for up to 37 months to monitor adverse events and tuberculosis incidence.
  • Results indicated that more infants who received MVA85A experienced local adverse events compared to those who got the placebo, highlighting the need for further investigation into the vaccine's safety and potential effectiveness.
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Background: Despite the availability of Bacille Calmette Guérin (BCG) vaccines, Mycobacterium tuberculosis currently infects billions of people and millions die annually from tuberculosis (TB) disease. New TB vaccines are urgently needed.

Methods: We studied the ability of AERAS-402, a recombinant, replication-deficient adenovirus type 35 expressing the protective M.

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To gain insight into the early stages of speciation, we reconstructed a DNA-based phylogeny, using combined mitochondrial (cytochrome c oxidase subunits I and II: 1008 bp) and nuclear (elongation factor 1-alpha and wingless: 1062 bp) markers of populations of the moth Galagete darwini endemic to the Galápagos, which belongs to an insular radiation similar in size to that of Darwin's finches. Adults of G. darwini were collected in the arid lowlands of 11 of the Galápagos Islands (Baltra, Española, Fernandina, Floreana, Isabela, Pinta, Pinzón, San Cristobal, Santa Cruz, Santiago and Seymour) and the humid highlands of a subset of 5 of them (Fernandina, Floreana, Isabela, Santa Cruz and Santiago).

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Galagete is a genus of microlepidoptera including 12 nominate species endemic to the Galapagos Islands. In order to better understand the diversification of this endemic insular radiation, to unravel relationships among species and populations, and to get insight into the early stages of speciation, we developed a phylogenetic reconstruction based on the combined mitochondrial cytochrome oxidase I (555bp) and II (453bp), and the nuclear elongation factor-1alpha (711bp) and wingless (351bp) genes. Monophyly of the genus is strongly supported in the Bayesian and maximum likelihood analyses suggesting a single colonization event by a common ancestor.

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To evaluate the safety and immunogenicity of palivizumab, 55 children who received palivizumab in the IMpact-RSV trial received 5 monthly doses of 15 mg/kg palivizumab (Synagis) during the subsequent year. The single child with an antipalivizumab titer of >1/40 had no associated serious adverse events and had expected serum palivizumab trough concentrations. Second year palivizumab prophylaxis was safe and well-tolerated.

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