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| 1 | Cytomegalovirus and ulcerative colitis:Place of antiviraltherapy显示文摘The link between cytomegalovirus(CMV) infection and inflammatory bowel diseases remains an important subject of debate. CMV infection is frequent in ulcerative colitis(UC) and has been shown to be potentially harmful. CMV reactivation needs to be diagnosed using methods that include in situ detection of viral markers by immunohistochemistry or by nucleic acid amplification techniques. Determination of the density of infection using quantitative tools(numbers of infected cells or copies of the genome) is particularly important. Although CMV reactivation can be considered as an innocent bystander in active flareups of refractory UC, an increasing number of studies suggest a deleterious role of CMV in this situation. The presence of colonic CMV infection is possibly linked to a decreased response to steroids and other immunosuppressive agents. Some treatments, notably steroids and cyclosporine A, have been shown to favor CMV reactivation, which seems not to be the case for therapies using anti-tumor necrosis factor drugs. According to these findings, in flare-ups of refractory UC, it is now recommended to look for the presence of CMV reactivation by using quantitative tools in colonic biopsies and to treat them with ganciclovir in cases of high viral load or severe disease. | Sylvie Pillet Bruno Pozzetto Xavier Roblin | 2016 | World Journal of Gastroenterology2016，22，6： | 19 |
| 2 | Is transfusion-transmitted dengue fever a potential public health threat?显示文摘Dengue is an arboviruses due to single-stranded enveloped ribonucleic acid viruses, named dengue viruses(DENV), that include four serotypes and are mainly transmitted via the bite of mosquitoes of the genus Aedes(A. aegypti and A. albopictus). The distribution of the disease was historically limited to intertropical areas; however, during the last thirty years, the perimeter of the disease extended considerably and temperate areas are now at risk of outbreaks. The present global burden of dengue is considerable: 2.5 billion people over more than 100 countries are concerned; 50 to 100 million infections occur every year, with a number of fatal cases of approximately 20000. Although frequently asymptomatic or limited to a mild fever, dengue is responsible for severe cases mainly consecutive to the occurrence of hemorrhagic complications that can lead to shock and death, notably in children from poorresource settings. The place of DENV as a transfusiontransmitted pathogen has been recognized only in 2008. At the present time, only five cases of transfusiontransmitted dengue, including one case of dengue hemorrhagic fever, have been formerly documented. This review provides a general overview of dengue, its viruses and their vectors. It replaces the disease in the context of other viral diseases transmitted by arthropods. It discusses the threat of dengue on the supply of blood products in endemic and non endemic areas. Finally, it describes the specific and non specific measures available for improving the security of blood products with regards to this emerging risk. Interestingly, in 2009, the American Association of Blood Banks placed DENV in the highest category of emerging infectious agents for their potential impact on transfusion recipient safety for the next years in North America. | Bruno Pozzetto Meriam Memmi Olivier Garraud | 2015 | World Journal of Virology2015，4，2： | 7 |
| 3 | Health care-associated hepatitis C virus infection显示文摘Hepatitis C virus(HCV)is a blood-borne pathogen that has a worldwide distribution and infects millions of people.Care-associated HCV infections represented a huge part of hepatitis C burden in the past via contaminated blood and unsafe injections and continue to be a serious problem of public health.The present review proposes a panorama of health care-associated HCV infections via the three mode of contamination that have been identified:(1)infected patient to non-infected patient;(2)infected patient to non-infected health careworker(HCW);and(3)infected HCW to non infected patient.For each condition,the circumstances of contamination are described together with the means to prevent them.As a whole,the more important risk is represented by unsafe practices regarding injections,notably with the improper use of multidose vials used for multiple patients.The questions of occupational exposures and infected HCWs are also discussed.In terms of prevention and surveillance,the main arm for combating care-associated HCV infections is the implementation of standard precautions in all the fields of cares,with training programs and audits to verify their good application.HCWs must be sensitized to the risk of blood-borne pathogens,notably by the use of safety devices for injections and good hygiene practices in the operating theatre and in all the invasive procedures.The providers performing exposed-prone procedures must monitor their HCV serology regularly in order to detect early any primary infection and to treat it without delay.With the need to stay vigilant because HCV infection is often a hidden risk,it can be hoped that the number of people infected by HCV via health care will decrease very significantly in the next years. | Bruno Pozzetto Meriam Memmi Olivier Garraud Xavier Roblin Philippe Berthelot | 2014 | World Journal of Gastroenterology2014，20，46： | 5 |
| 4 | A longitudinal study of SARS-CoV-2-infected patients reveals a high correlation between neutralizing antibodies and COVID-19 severity显示文摘Understanding the immune responses elicited by SARS-CoV-2 infection is critical in terms of protection against reinfection and,thus,for public health policy and vaccine development for COVID-19.In this study,using either live SARS-CoV-2 particles or retroviruses pseudotyped with the SARS-CoV-2 S viral surface protein(Spike),we studied the neutralizing antibody(nAb)response in serum samples from a cohort of 140 SARS-CoV-2 qPCR-confirmed infections,including patients with mild symptoms and also more severe forms,including those that required intensive care.We show that nAb titers correlated strongly with disease severity and with anti-spike IgG levels.Indeed,patients from intensive care units exhibited high nAb titers;conversely,patients with milder disease symptoms had heterogeneous nAb titers,and asymptomatic or exclusive outpatient-care patients had no or low nAbs.We found that nAb activity in SARS-CoV-2-infected patients displayed a relatively rapid decline after recovery compared to individuals infected with other coronaviruses.Moreover,we found an absence of cross-neutralization between endemic coronaviruses and SARS-CoV-2,indicating that previous infection by human coronaviruses may not generate protective nAbs against SARS-CoV-2.Finally,we found that the D614G mutation in the spike protein,which has recently been identified as the current major variant in Europe,does not allow neutralization escape.Altogether,our results contribute to our understanding of the immune correlates of SARS-CoV-2-induced disease,and rapid evaluation of the role of the humoral response in the pathogenesis of SARS-CoV-2 is warranted. | Vincent Legros Solène Denolly Manon Vogrig Bertrand Boson Eglantine Siret Josselin Rigaill Sylvie Pillet Florence Grattard Sylvie Gonzalo Paul Verhoeven Omran Allatif Philippe Berthelot Carole Pélissier Guillaume Thiery Elisabeth Botelho-Nevers Guillaume Millet Jérôme Morel Stéphane Paul Thierry Walzer François-Loïc Cosset Thomas Bourlet Bruno Pozzetto | 2021 | Cellular & Molecular Immunology2021，18，2： | 3 |
| 5 | Management of cytomegalovirus infection in inflammatory bowel diseases显示文摘 | Sylvie Pillet Bruno Pozzetto Camille Jarlot Stéphane Paul Xavier Roblin | 2012 | Digestive and Liver Disease2012，，7： | 2 |
| 6 | Epidemiology and microbiological investigations of community-acquired pneumonia in children admitted at the emergency department of a university hospital显示文摘 | Aymeric Cantais Olivier Mory Sylvie Pillet Paul O. Verhoeven Julie Bonneau Hugues Patural Bruno Pozzetto | 2014 | Journal of Clinical Virology2014，，： | 1 |
| 7 | Semen lactoferrin promotes CCL20 production by epithelial cells: Involvement in HIV transmission显示文摘AIM: To study the effect of seminal plasma on Chemokine(C-C motif) ligand 20(CCL20) production by epithelial cells and its relationship with lactoferrin.METHODS: HEC-1A cells, a cell line derived from a monostratified endocervical epithelium, were incubated with samples of seminal plasma(diluted 1:10 in culture medium) recovered from human immunodeficiency virus(HIV) seronegative(HIV-) or HIV seropositive(HIV+) subjects. Recombinant human interleukin 1 beta(IL-1β) was used as positive control, and culture medium only as negative control. The measurement of CCL20 production in the supernatants of HEC-1A cells and of lactoferrin in seminal plasma was determined by enzyme-linked immunosorbent assay techniques. A fractionation of seminal plasma proteins was performed by ion exchange chromatography on a pool of seminal plasma specimens from HIV- subjects. Each fraction was tested for its ability to stimulate the production of CCL20 by HEC-1A cells and for its lactoferrin concentration. The HIV viral load in seminal plasma samples from HIV+ patients was measured using the HIV-Monitor kit(Roche Diagnostic Systems, Branchburg, NJ, United States).RESULTS: The positive control IL-1β was responsible for an increase of 11.36 ± 3.36 times in the production of CCL20. Stimulation of HEC-1A cells was performed in 34 seminal plasma samples(22 from HIV+ subjects and 12 from HIV- subjects). The mean production of CCL20 by HEC-1A in presence of seminal plasma from HIV- and HIV+ subjects was respectively 5.38 ± 0.91 and 7.57 ± 3.26 times higher than that obtained with the untreated cells(P < 0.05 between the two groups). Using the same 34 specimens of seminal plasma, no correlation was observed between the concentration of total proteins in seminal plasma and their ability to stimulate the secretion of CCL20 by HEC-1 cells. In contrast, the ability to produce CCL20 by HEC-1A cells correlated to the concentration of lactoferrin in the seminal plasma samples(r coefficient = 0.56; CI: 0.26-0.76; P < 0.001). After fractionation by ion exchange chromatography, the seminal plasma fractions exhibiting the highest concentrations of lactoferrin were responsible for the greatest stimulation of CCL20 production by HEC-1A cells(r coefficient = 0.89; CI: 0.78-0.95; P <0.0001). CONCLUSION: Lactoferrin present in seminal plasma correlated with an increased production of CCL20 by HEC-1A cells and therefore could facilitate HIV entry through the genital mucosa. | Alan Grupioni Loureno Marilena Chinalli Komesu Alcyone Artioli Machado Silvana Maria Quintana Thomas Bourlet Bruno Pozzetto Olivier Delézay | 2014 | World Journal of Virology2014，3，2： | 0 |
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