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Menotti J, Porcher R, Ribaud P, Lacroix C, Jolivet V, Hamane S, Derouin F. Monitoring of nosocomial invasive aspergillosis and early evidence of an outbreak using cumulative sum tests (CUSUM). Clin Microbiol Infect 2010. [DOI: 10.1111/j.1469-0691.2010.03150.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Lafaurie M, Lapalu J, Raffoux E, Breton B, Lacroix C, Socié G, Porcher R, Ribaud P, Touratier S, Molina JM. High rate of breakthrough invasive aspergillosis among patients receiving caspofungin for persistent fever and neutropenia. Clin Microbiol Infect 2010; 16:1191-6. [DOI: 10.1111/j.1469-0691.2009.03050.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Santos EG, Iglesias JR, Lacroix C, Gusmão MA. A two-band model for superconductivity in the checkerboard lattice. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:215701. [PMID: 21393724 DOI: 10.1088/0953-8984/22/21/215701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Motivated by the superconducting properties of the metallic oxide Cd(2)Re(2)O(7), whose crystal structure is of the pyrochlore type, we propose an electronic model on a checkerboard lattice, which can be viewed as a two-dimensional analog of the pyrochlore lattice. Including only charge degrees of freedom, we treat the model via a Bardeen-Cooper-Schrieffer (BCS) approximation, decoupling the interaction terms in real space. Going over to reciprocal space yields a BCS model with two coupled bands. Characteristic properties such as order parameters and specific heat as functions of temperature are obtained. We also discuss the symmetry properties of the superconducting gap in wavevector space and the behavior of the critical temperature as a function of the electronic doping for various values of the interaction strength.
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Reimann S, Grattepanche F, Baggenstos C, Rezzonico E, Berger B, Arigoni F, Lacroix C. Development of a rapid screening protocol for selection of strains resistant to spray drying and storage in dry powder. Benef Microbes 2010; 1:165-74. [PMID: 21840804 DOI: 10.3920/bm2009.0034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
An efficient screening method for selection of Bifidobacterium longum strains resistant to spray drying and storage was developed based on randomly amplified polymorphic DNA (RAPD) for identification of the best survivors in mixed strains bacterial preparations. Three different primers were used to generate RAPD profiles of 22 B. longum strains. All strains were distinguished according to their RAPD profiles except for the strain NCC2705 and its H(2)O(2) resistant derivative variant. The 22 strains were grouped in 3 batches of 7, 7 and 8 strains and subjected to spray drying and storage at 30 and 37 °C under anaerobic conditions. Batch survival rates after spray drying reached 17.1±4.4%. Strains showing the highest prevalence and/or resistance to storage at 37 °C were selected from individual batches for subsequent spray drying and storage testing. After 67 days of storage, NCC572 was identified as the dominant strain in powder. The stability of strain NCC572 was confirmed by performing single spray drying and storage tests. Out of 22 B. longum strains, a robust strain was identified by combining RAPD with a simultaneous screening test for survival under spray drying and storage. The method allowed a fast screening of B. longum strains in mixture for resistance to spray drying and storage compared to traditional screening procedures carried out with individual strains, in the same conditions. This approach could be applied to other stress conditions.
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Cleusix V, Lacroix C, Dasen G, Leo M, Le Blay G. Comparative study of a new quantitative real-time PCR targeting the xylulose-5-phosphate/fructose-6-phosphate phosphoketolase bifidobacterial gene (xfp) in faecal samples with two fluorescence in situ hybridization methods. J Appl Microbiol 2010; 108:181-93. [PMID: 19566721 DOI: 10.1111/j.1365-2672.2009.04408.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS To detect and enumerate bifidobacteria in faeces with a new quantitative multiplex real-time PCR (qPCR) method and to compare the results obtained with fluorescence in situ hybridization (FISH) methods. METHODS AND RESULTS A multiplex qPCR assay was developed, which enabled the enumeration of Bifidobacterium spp. by targeting the bifidobacterial xylulose-5-phosphate/fructose-6-phosphate phosphoketolase gene (xfp) and total bacteria using universal Eub-primers targeting 16S rRNA gene from the domain bacteria. The qPCR assay showed high sensitivity and specificity and a low detection limit of about 2.5 x 10(3) bifidobacterial cells per gram of faeces. The qPCR results were compared with FISH combined with microscopy or flow cytometry (FCM). No statistical differences among bifidobacterial counts averages measured in adult faeces with the three methods were observed. Total bacterial count averages were higher with the FISH method coupled with microscopic analyses compared to FISH with FCM, whereas total cell numbers estimated by qPCR were intermediate between the two FISH methods. CONCLUSIONS The new qPCR assay was shown to be sensitive, rapid and accurate for enumerating bifidobacteria in faeces. SIGNIFICANCE AND IMPACT OF THE STUDY This method is a valuable alternative for other molecular methods for detecting faecal bifidobacteria, especially when their counts are below the detection limit of the FISH methods.
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Goullé JP, Saussereau E, Mahieu L, Bouige D, Guerbet M, Lacroix C. Le profil métallique : un nouveau concept médical. Rev Med Interne 2010; 31:128-34. [DOI: 10.1016/j.revmed.2009.03.360] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Revised: 03/02/2009] [Accepted: 03/02/2009] [Indexed: 11/16/2022]
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82
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Cardinal M, Meghrous J, Lacroix C, Simard RE. Isolation oflactococcus lactisstrains producing inhibitory activity againstlisteria. FOOD BIOTECHNOL 2009. [DOI: 10.1080/08905439709549928] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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83
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Kheadr E, Zihler A, Dabour N, Lacroix C, Le Blay G, Fliss I. Study of the physicochemical and biological stability of pediocin PA-1 in the upper gastrointestinal tract conditions using a dynamic in vitro model. J Appl Microbiol 2009; 109:54-64. [PMID: 20059619 DOI: 10.1111/j.1365-2672.2009.04644.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS To evaluate the survival of Pediococcus acidilactici UL5 and its ability to produce pediocin PA-1 during transit in an artificial gastrointestinal tract (GIT). To investigate the physicochemical and biological stability of purified pediocin PA-1 under GIT conditions. METHODS AND RESULTS Skim milk culture of Ped. acidilactici UL5 was fed to a dynamic gastrointestinal (GI) model known as TIM-1, comprising four compartments connected by computer-controlled peristaltic valves and simulating the human stomach, duodenum, jejunum and ileum. This strain tolerated a pH of 2·7 in the gastric compartment, while lower pH reduced its viability. Bile salts in the duodenal compartment brought a further 4-log reduction after 180 min of digestion, while high viable counts (up to 5 × 10(7) CFU ml(-1) fermented milk) of Ped. acidilactici were found in both the jejunal and ileal compartments. Pediococcus acidilactici recovered from all four compartments was able to produce pediocin at the same level as unstressed cells. The activity of the purified pediocin in the gastric compartment was slightly reduced after 90 min of gastric digestion, while no detectable activity was found in the duodenal, jejunal and ileal compartments during 5 h of digestion. HPLC analysis showed partial degradation of the pediocin peptide in the duodenal compartment and massive breakdown in the jejunal and ileal compartments. CONCLUSIONS Pediococcus acidilactici UL5 showed high resistance to GIT conditions, and its ability to produce pediocin was not affected, suggesting its potential as a probiotic candidate. The physicochemical and biological stability of pediocin was significantly poor under GIT conditions. SIGNIFICANCE AND IMPACT OF THE STUDY Pediococcus acidilactici UL5 appears to be a potential probiotic candidate because its capacity to produce pediocin PA-1 is not affected by the GI conditions as well as the strain shows an acceptable survival rate. Meanwhile, purified pediocin PA-1 losses activity during GIT transit; microcapsules could be used to deliver it to the target site.
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Vialle R, Lacroix C, Harding I, Loureiro MC, Tadié M. Motor and sensitive axonal regrowth after multiple intercosto-lumbar neurotizations in a sheep model. Spinal Cord 2009; 48:367-74. [DOI: 10.1038/sc.2009.144] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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85
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Goullé JP, Cattanéo A, Saussereau E, Mahieu L, Guerbet M, Lacroix C. Erratum to “MRI gadolinium-based contrast agents. Radiologists beware!” [Ann Pharm Fr 2009;67:335–9]. ANNALES PHARMACEUTIQUES FRANÇAISES 2009. [DOI: 10.1016/j.pharma.2009.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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86
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Goullé JP, Cattanéo A, Saussereau E, Mahieu L, Guerbet M, Lacroix C. MRI gadolinium-based contrast agents. Radiologists beware! ANNALES PHARMACEUTIQUES FRANÇAISES 2009; 67:335-9. [DOI: 10.1016/j.pharma.2009.06.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2009] [Revised: 06/03/2009] [Accepted: 06/05/2009] [Indexed: 11/25/2022]
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Mathys S, Meile L, Lacroix C. Co-cultivation of a bacteriocin-producing mixed culture ofBifidobacterium thermophilumRBL67 andPediococcus acidilacticiUVA1 isolated from baby faeces. J Appl Microbiol 2009; 107:36-46. [DOI: 10.1111/j.1365-2672.2009.04186.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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88
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Zihler A, Le Blay G, de Wouters T, Lacroix C, Braegger C, Lehner A, Tischler P, Rattei T, Hächler H, Stephan R. In vitroinhibition activity of different bacteriocin-producingEscherichia coliagainstSalmonellastrains isolated from clinical cases. Lett Appl Microbiol 2009; 49:31-8. [DOI: 10.1111/j.1472-765x.2009.02614.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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89
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Goulle JP, Saussereau E, Mahieu L, Bouige D, Groenwont S, Guerbet M, Lacroix C. Application of Inductively Coupled Plasma Mass Spectrometry Multielement Analysis in Fingernail and Toenail as a Biomarker of Metal Exposure. J Anal Toxicol 2009; 33:92-8. [DOI: 10.1093/jat/33.2.92] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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90
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Tahiri I, Desbiens M, Lacroix C, Kheadr E, Fliss I. Growth of Carnobacterium divergens M35 and production of Divergicin M35 in snow crab by-product, a natural-grade medium. Lebensm Wiss Technol 2009. [DOI: 10.1016/j.lwt.2008.08.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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91
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Kalitsov A, Canals B, Lacroix C. Anomalous Hall effect due to magnetic chirality in the pyrochlore lattice. ACTA ACUST UNITED AC 2009. [DOI: 10.1088/1742-6596/145/1/012020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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92
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Pepin J, Tremblay V, Bechard D, Rodier F, Walker C, Dufresne D, Lafontaine A, Li N, Lacroix C, Lanthier L. Chronic antiplatelet therapy and mortality among patients with infective endocarditis. Clin Microbiol Infect 2009; 15:193-9. [DOI: 10.1111/j.1469-0691.2008.02665.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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93
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Adams D, Lacroix C, Antonini T, Lozeron P, Denier C, Epelbaum S, Karam V, Blandin F, Azulay D, Adam R, Castaing D, Samuel D. Risque de neuropathie amyloïde à transthyrétine de novo après transplantation hépatique Domino de neuropathie amyloïde familiale (NAF). Rev Neurol (Paris) 2009. [DOI: 10.1016/s0035-3787(09)70019-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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94
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Denier C, Tertian G, Ribrag V, Lozeron P, Bilhou-Nabera C, Lazure T, Abbed K, Lacroix C, Adams D. Multifocal deficits due to leukemic meningoradiculitis in chronic lymphocytic leukemia. J Neurol Sci 2008; 277:130-2. [PMID: 19100998 DOI: 10.1016/j.jns.2008.11.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2008] [Revised: 10/22/2008] [Accepted: 11/03/2008] [Indexed: 11/28/2022]
Abstract
Symptomatic nervous system leukemic infiltration is rarely observed in CLL. Various clinical manifestations including headache, confusion, cranial nerve palsies, focal central deficits and peripheral neuropathies have been seldom reported, occurring in less than 1% of patients. We report herein 2 CLL patients with unusual clinical presentations of nervous system invasion. They presented multiple progressive peripheral deficits due to meningoradiculitis. In both, CSF immunophenotyping analysis identified a majority of T cells (>90%), and less than 10% of B-CLL cells expressing CD5, CD19 and CD20. Our analyses revealed the transformation of CLL into an aggressive B-cell lymphoma in one case (Richter's syndrome). A post mortem study showed massive infiltration of cranial nerves and spinal roots by large B lymphomatous cells. In the other case, CNS oriented chemotherapy led to remission and total neurological recovery. In practice, the etiological diagnosis of neurological deficits in CLL patients is difficult. CSF analysis may be useful, requiring viral PCR, repeated cytological studies and immunophenotyping analysis. Although rare, leptomeningeal leukemic localization has to be discussed, even in the absence of overt Richter syndrome, and may require an early therapeutic test.
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Lagrange-Xélot M, Schlemmer F, Gallien S, Lacroix C, Molina J. Trichoderma fungaemia in a neutropenic patient with pulmonary cancer and human immunodeficiency virus infection. Clin Microbiol Infect 2008; 14:1190-2. [DOI: 10.1111/j.1469-0691.2008.02111.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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96
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Dhermain F, Ducreux D, Parker F, Page P, Hoang-Xuan K, Lacroix C, Daumas-Duport C, Lasjaunias P, Tournay E, Bourhis J. Gliomes de bas grade : importance de la perfusion et de la perméabilité dans la prédiction des rechutes. Cancer Radiother 2008. [DOI: 10.1016/j.canrad.2008.08.245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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97
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Doleyres Y, Fliss I, Lacroix C. Continuous Production of Mixed Lactic Starters Containing Probiotics Using Immobilized Cell Technology. Biotechnol Prog 2008; 20:145-50. [PMID: 14763837 DOI: 10.1021/bp020096w] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The production of a mixed lactic culture containing Lactococcus lactis subsp. lactis biovar. diacetylactis MD and Bifidobacterium longum ATCC 15707 was studied during a 17-day continuous immobilized-cell culture at different temperatures between 32 and 37 degrees C. The two-stage fermentation system was composed of a first reactor (R1) containing cells of the two strains separately immobilized in kappa-carrageenan/locust bean gum gel beads and a second reactor (R2) operated with free cells released from the first reactor. The system allowed continuous production of a concentrated mixed culture with a strain ratio whose composition depended on temperature and fermentation time. A stable mixed culture (with a 22:1 ratio of L. diacetylactis and B. longum) was produced at 35 degrees C in the effluent of R2, whereas the mixed culture was rapidly unbalanced in favor of B. longum at a higher temperature (37 degrees C) or L. diacetylactis at a lower temperature (32 degrees C). Strain redistribution in beads originally immobilizing pure cultures of L. diacetylactis or B. longum was observed. At the end of culture, the strain ratio (7:1 L. diacetylactis/B. longum) in bulk bead samples was similar to that of individual beads. The determination of the spatial distribution of the two strains in gel beads by immunofluorescence and confocal laser-scanning microscopy showed that bead cross-contamination was limited to a 100 microm peripheral layer. Data from this study validate a previous model for population dynamics and cell release in gel beads during mixed immobilized-cell cultures.
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Quon H, Hasbini A, Cougnard J, Djafari L, Lacroix C, Abdulkarim B. Multivariate Assessment of Tumor Angiogenesis as a Prognostic Factor for Survival in Patients with Oligodendroglioma and Anaplastic Oligodendroglioma. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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99
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Rolland M, Lacroix C, Blanchard A, Baldwin T, Kerlan C, Jacquot E. [Potato virus Y (PVY): from its discovery to the latest outbreaks]. Virologie (Montrouge) 2008; 12:261-273. [PMID: 36131411 DOI: 10.1684/vir.2011.11691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Potato virus Y (PVY, family Potyviridae, genus Potyvirus) is one of the most economically important viruses infecting potato. This plant virus is transmitted by aphids and is present in all potato growing areas across the world. Thanks to the steady set-up of biological, serological and molecular detection/characterization tools, PVY potato strain isolates have been classified in groups (PVYN, PVYO, PVYC, PVYZ and PVYE) or as sub-groups (PVYNTN and PVYN-W). Epidemiological data available for PVY show the recent modification of PVY group and sub-group proportions in PVY populations. This modification has led to the current prevalence of necrotic recombinant PVY isolates. In order to identify factors involved in this evolution of PVY populations, characterization of i) the molecular determinants of necrotic properties, ii) the impact of the increase of PVY virulence and aggressiveness on fitness, iii) the role of recombination in PVY evolution and iv) the genetic variability of viral populations have been carried out. The main results of this research have been combined with data already published to write the present review.
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Schlemmer F, Lagrange-Xélot M, Lacroix C, de La Tour R, Socié G, Molina JM. Breakthrough Rhizopus infection on posaconazole prophylaxis following allogeneic stem cell transplantation. Bone Marrow Transplant 2008; 42:551-2. [PMID: 18622416 DOI: 10.1038/bmt.2008.199] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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