Publications by authors named "Thellier Marc"

This article examines the historical and ongoing efforts to fight malaria, a parasitic disease caused by species and transmitted by mosquitoes. Despite over a century of control efforts, malaria remains a major global health issue. In 2022, there were an estimated 249 million cases across 85 countries, leading to approximately 600,000 deaths.

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Article Synopsis
  • In European France, malaria cases are primarily travel-related, but locally acquired cases are monitored to assess the risk of re-emergence.
  • A study analyzed malaria cases from 1995 to 2022, identifying transmission modes and species involved, which mostly occurred in the Île-de-France region.
  • The findings revealed 117 local cases, predominantly classified as Odyssean malaria, with a need for increased vigilance due to potential re-emergence linked to climate change and local mosquito populations.
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Objectives: We aimed to evaluate the impact of malaria declaration year (before or after 2017) on the frequency of hospitalization in metropolitan France of patients with uncomplicated non-vomiting P.falciparum malaria.

Patients And Methods: An observational, multicenter, retrospective study was carried out, using the database from the French National Reference Centre for Malaria.

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  • Monitoring antimalarial drug resistance in Africa is crucial due to changing responses to treatments, particularly in Eastern Africa.
  • A study analyzed antimalarial susceptibility in 805 isolates from travelers returning to France, revealing significantly decreased susceptibility to lumefantrine and monodesethylamodiaquine from 2019-2023 compared to 2016-2018.
  • The research indicates low levels of artemisinin resistance markers but highlights a concerning decline in effectiveness of widely used partner drugs, suggesting a need for enhanced monitoring efforts.
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Given the altered responses to both artemisinins and lumefantrine in Eastern Africa, monitoring antimalarial drug resistance in all African countries is paramount. We measured the susceptibility to six antimalarials using growth inhibition assays (IC ) for a total of 805 isolates obtained from travelers returning to France (2016-2023), mainly from West and Central Africa. Isolates were sequenced using molecular inversion probes (MIPs) targeting fourteen drug resistance genes across the parasite genome.

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Malaria is a deadly disease that is transmitted through mosquito bites. Microscopists use a microscope to examine thin blood smears at high magnification (1000x) to identify parasites in red blood cells (RBCs). Estimating parasitemia is essential in determining the severity of the Plasmodium falciparum infection and guiding treatment.

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  • Positive direct antiglobulin tests (DATs) were found in a study on post-artesunate delayed hemolysis (PADH), but the relationship between DAT positivity and PADH is not clear.
  • In a 7-year study of 337 severe malaria patients treated with artesunate, 54.3% of those who had DAT results experienced positive results, yet this did not correlate with the occurrence of PADH.
  • The findings suggest that DAT positivity is not a reliable marker for PADH and should not prompt the use of corticosteroids in treatment.
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Background: Experimental infection with Plasmodium falciparum results in malaria attack within a few days of exposure. However, we have regularly observed malaria attack within a short time after return, regardless of the time spent in an endemic area. We therefore aimed to assess whether the time before return and malaria attack varies according to length of stay.

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is the most frequent and widely distributed cause of recurring malaria. It is a public health issue that mostly occurs in Southeast Asia, followed by the Middle East, Latin, and South Americas and sub-Saharan Africa. Although it is commonly known as an etiologic agent of malaria with mild clinical manifestations, it can lead to severe complications.

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The diagnosis of many diseases relies, at least on first intention, on an analysis of blood smears acquired with a microscope. However, image quality is often insufficient for the automation of such processing. A promising improvement concerns the acquisition of enriched information on samples.

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  • Researchers tested a cream containing paromomycin (with or without gentamicin) on travelers with cutaneous leishmaniasis (CL), achieving cure rates of 75-82%, comparable to clinical trials.
  • Two groups were studied: one treated under supervision (Group 1) and another using a locally produced paromomycin-only cream (Group 2), both showing similar medical outcomes despite some differences in cure rates.
  • Adverse effects were mostly mild, with common issues being itching and pain, and no serious complications or mucosal involvement occurred throughout the study.
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Digital pathology based on a whole slide imaging system is about to permit a major breakthrough in automated diagnosis for rapid and highly sensitive disease detection. High-resolution FPM (Fourier ptychographic microscopy) slide scanners delivering rich information on biological samples are becoming available. They allow new effective data exploitation for efficient automated diagnosis.

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Background: Exposure of blood to malaria parasites can lead to infection even in the absence of the mosquito vector. During a stay in a healthcare facility, accidental inoculation of the skin with blood from a malaria patient might occur, referred to as nosocomial malaria.

Methods: Between 2007 and 2021, we identified 6 autochthonous malaria cases that occurred in different French hospitals, originating from nosocomial transmission and imported malaria cases being the infection source.

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Background: The impact of chemoprophylaxis targeting Plasmodium falciparum on Plasmodium vivax and Plasmodium ovale, which may remain quiescent as hypnozoites in the liver, is debated.

Methods: We conducted a nested case-control analysis of the outcomes of P. vivax and P.

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  • An electronic surveillance system was implemented in France to monitor the incidence of imported malaria cases and assess the sensitivity of malaria isolates among travelers.
  • The study evaluated the system based on the quality of surveillance, early warning capacity for public health events, and healthcare practitioners' usage of the online system.
  • Results showed a significant improvement, with the time to report cases dropping from about 227 days in 2006 to just 2 days in 2020, proving the system's effectiveness for future malaria research.
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In acute malaria, the bulk of erythrocyte loss occurs after therapy, with a nadir of hemoglobin generally observed 3-7 days after treatment. The fine mechanisms leading to this early post-treatment anemia are still elusive. We explored pathological changes in RBC subpopulations by quantifying biochemical and mechanical alterations during severe malaria treated with artemisinin derivatives, a drug family that induce "pitting" in the spleen.

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Background: Microsporidiosis has been largely reported in patients with acquired immunodeficiency syndrome, but emerged as a cause of persistent diarrhea in solid organ transplant patients.

Methods: Through the French Microsporidiosis Network and the Groupe français de recherche en greffe de foie, we collected all microsporidiosis cases identified in liver transplant patients between 1995 and 2020 in France.

Results: We identified 24 liver transplant recipients with microsporidiosis.

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Background: Intravenous artesunate is the World Health Organization-recommended first-line treatment for severe malaria worldwide, but it is still not fully licensed in Europe. Observational studies documenting its safety and efficacy in imported malaria are thus essential.

Methods: We prospectively collected clinical and epidemiological features of 1391 artesunate-treated patients among 110 participant centers during the first 7 years (2011-2017) of a national program implemented by the French Drug Agency.

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We retrospectively analyzed epidemiologic, clinical, and biologic characteristics of 368 Plasmodium ovale wallikeri and 309 P. ovale curtisi infections treated in France during January 2013–December 2018. P.

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IntroductionMalaria is a notifiable disease in all European Union and European Economic Area countries except Belgium and France, where only autochthonous malaria is notifiable. Although morbidity caused by malaria has been assessed, little is known about mortality incidence.ObjectiveOur aim was to estimate the number of imported malaria-related deaths in hospital in metropolitan France.

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Invasive pulmonary aspergillosis is a complication in critically ill patients with acute respiratory distress syndrome, especially those with severe influenza pneumonia. We report a fatal case of invasive pulmonary aspergillosis in an immunocompetent patient in France who had severe coronavirus disease-associated pneumonia.

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After publication of the original article [1], we were notified that family names have been exchanged with the first names for all authors. Below the name are tagged correctly.

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Background: In France, the incidence of severe imported malaria cases increased since early 2000. Artesunate was available (temporarily use authorization) since mid-2011 in France and commonly used for severe malaria since early 2013. Thus, the study objectives were to describe the patients with severe imported malaria admitted in intensive care unit (ICU) and assess the changes in clinical presentation and outcomes before and after this date.

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