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Perry N, Boulton KA, Hodge A, Ong N, Phillips N, Howard K, Raghunandan R, Silove N, Guastella AJ. A psychometric investigation of health-related quality of life measures for paediatric neurodevelopment assessment: Reliability and concurrent validity of the PEDS-QL, CHU-9D, and the EQ-5D-Y. Autism Res 2024. [PMID: 38597587 DOI: 10.1002/aur.3127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 03/19/2024] [Indexed: 04/11/2024]
Abstract
There is a need for tools that can provide a brief assessment of functioning for children with neurodevelopmental conditions, including health-related quality of life (HR-QoL). This study evaluated the psychometric properties of three commonly used and well known HR-QoL measures in a cohort of children presenting to clinical developmental assessment services. The most common diagnoses received in these assessment services were autism spectrum disorders. Findings showed good internal consistency for the PedsQL and the CHU-9D, but not the EQ-5D-Y. This research also found that the CHU-9D, EQ-5D-Y, and PedsQL correlated with relevant functioning domains assessed by the VABS-III. Overall, the measures showed that children with neurodevelopmental conditions experienced poor HR-QoL. The majority of children (>86%) met cut-off criteria for significant health concerns on the PedsQL. On the EQ-5D-Y and CHU-9D, they showed reduced HR-QoL particularly on domains relating to school and homework, being able to join in activities, looking after self, and doing usual activities. This study supports the use of the CHU-9D and PedsQL in this population to assess and potentially track HR-QoL in a broad neurodevelopment paediatric population.
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Affiliation(s)
- N Perry
- Clinic for Autism and Neurodevelopment (CAN) Research, Brain and Mind Centre, Children's Hospital Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
- Child Neurodevelopment and Mental Health Team, Brain and Mind Centre, University of Sydney, Sydney, New South Wales, Australia
| | - K A Boulton
- Clinic for Autism and Neurodevelopment (CAN) Research, Brain and Mind Centre, Children's Hospital Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
- Child Neurodevelopment and Mental Health Team, Brain and Mind Centre, University of Sydney, Sydney, New South Wales, Australia
| | - A Hodge
- Child Neurodevelopment and Mental Health Team, Brain and Mind Centre, University of Sydney, Sydney, New South Wales, Australia
- Child Development Unit, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - N Ong
- Child Neurodevelopment and Mental Health Team, Brain and Mind Centre, University of Sydney, Sydney, New South Wales, Australia
- Child Development Unit, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - N Phillips
- Clinic for Autism and Neurodevelopment (CAN) Research, Brain and Mind Centre, Children's Hospital Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
- Child Neurodevelopment and Mental Health Team, Brain and Mind Centre, University of Sydney, Sydney, New South Wales, Australia
| | - K Howard
- Menzies Centre for Health Policy and Economics, Sydney School of Public Health, Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
| | - R Raghunandan
- Menzies Centre for Health Policy and Economics, Sydney School of Public Health, Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
| | - N Silove
- Child Neurodevelopment and Mental Health Team, Brain and Mind Centre, University of Sydney, Sydney, New South Wales, Australia
- Child Development Unit, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - A J Guastella
- Clinic for Autism and Neurodevelopment (CAN) Research, Brain and Mind Centre, Children's Hospital Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
- Child Neurodevelopment and Mental Health Team, Brain and Mind Centre, University of Sydney, Sydney, New South Wales, Australia
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Perino J, Demourgues M, Ramaroson H, Bezin J, Micallef J, Miremont-Salamé G, Frauger E, Gilleron V, Ong N, Daveluy A. Increase in hospitalisation-associated methadone intoxication in France following first COVID-19 lockdown. Public Health 2023; 223:1-6. [PMID: 37572562 DOI: 10.1016/j.puhe.2023.07.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 06/20/2023] [Accepted: 07/04/2023] [Indexed: 08/14/2023]
Abstract
OBJECTIVES At the beginning of the COVID-19 pandemic, the French Addictovigilance Network drew attention to the need to facilitate access to methadone while ensuring its safe use, in order to avoid the occurrence of overdoses and deaths. The objectives of the study were to assess the impact of the lockdowns on the incidence of methadone-use-related hospitalisations (MUHs) and describe the characteristics of patients and hospitalisations. STUDY DESIGN An interrupted time series using the unobserved components model was performed to predict the monthly incidence of MUHs in 2020 on the basis of previous years' data and compared with MUHs observed. Data were presented with prediction intervals (PI95%). METHODS This retrospective study was conducted on patients hospitalised in France for methadone between 2014 and 2020, using the French national database hospital discharge database. Patients' characteristics and hospitalisations were described over four periods: before lockdown, first lockdown, after first lockdown, and second lockdown. RESULTS Compared to the predictions, a higher incidence of MUH was found during the first lockdown, especially in March 2020 (66 cases vs. 51.3; PI95%: 34-65), and there was a large increase during the month following the end of the first lockdown (79 cases vs. 61; PI95%: 46-75). Coconsumptions (alcohol, cannabis, cocaine) were more frequent during the first lockdown, whereas patients aged over 30 years were more concerned thereafter. The second lockdown did not present any particularity. CONCLUSIONS The first lockdown had a significant impact on the incidence of MUHs. These results confirm the data from the reinforced national monitoring during first lockdown published in 2020, where methadone was the primary substance involved in overdoses and deaths.
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Affiliation(s)
- J Perino
- Service de Pharmacologie Médicale, CHU de Bordeauxx, Centre de Pharmacovigilance de Bordeaux, F-33000 Bordeaux, France; University Bordeaux, INSERM, BPH, U1219, CHU de Bordeaux, F-33000 Bordeaux, France
| | - M Demourgues
- Service de Pharmacologie Médicale, CHU de Bordeauxx, Centre de Pharmacovigilance de Bordeaux, F-33000 Bordeaux, France
| | - H Ramaroson
- Service d'Information Médicale, Unité de Coordination et d'Analyse de l'Information Médicale-département d'Information Médicale (UCAIM-DIM), CHU de Bordeaux, F-33000 Bordeaux, France
| | - J Bezin
- University Bordeaux, INSERM, BPH, U1219, CHU de Bordeaux, F-33000 Bordeaux, France
| | - J Micallef
- Centre d'Addictovigilance, Aix Marseille University, AP-HM, INSERM, Institute Neuroscience System, Service de Pharmacologie Clinique et Pharmacovigilance, Marseille, France
| | - G Miremont-Salamé
- Service de Pharmacologie Médicale, CHU de Bordeauxx, Centre de Pharmacovigilance de Bordeaux, F-33000 Bordeaux, France; University Bordeaux, INSERM, BPH, U1219, CHU de Bordeaux, F-33000 Bordeaux, France; Service de Pharmacologie Médicale, Centre d'Addictovigilance, CHU de Bordeaux, F-33000 Bordeaux, France
| | - E Frauger
- Centre d'Addictovigilance, Aix Marseille University, AP-HM, INSERM, Institute Neuroscience System, Service de Pharmacologie Clinique et Pharmacovigilance, Marseille, France
| | - V Gilleron
- Service d'Information Médicale, Unité de Coordination et d'Analyse de l'Information Médicale-département d'Information Médicale (UCAIM-DIM), CHU de Bordeaux, F-33000 Bordeaux, France
| | - N Ong
- Service d'Information Médicale, Unité de Coordination et d'Analyse de l'Information Médicale-département d'Information Médicale (UCAIM-DIM), CHU de Bordeaux, F-33000 Bordeaux, France
| | - A Daveluy
- Service de Pharmacologie Médicale, CHU de Bordeauxx, Centre de Pharmacovigilance de Bordeaux, F-33000 Bordeaux, France; University Bordeaux, INSERM, BPH, U1219, CHU de Bordeaux, F-33000 Bordeaux, France; Service de Pharmacologie Médicale, Centre d'Addictovigilance, CHU de Bordeaux, F-33000 Bordeaux, France.
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Perino J, Ramaroson H, Ong N, Bezin J, Gilleron V, Daveluy A, Tournier M. General hospital admissions in young and middle-aged people who use psychoactive substances: Impact of Covid-19 lockdowns. Int J Drug Policy 2023; 118:104082. [PMID: 37336071 PMCID: PMC10247883 DOI: 10.1016/j.drugpo.2023.104082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 05/15/2023] [Accepted: 05/29/2023] [Indexed: 06/21/2023]
Abstract
BACKGROUNDS The Covid-19 pandemic offered a unique opportunity to investigate trends in hospitalizations related to psychoactive substance intoxication, since the usual health burden of social use at parties and gatherings was likely to be decreased during lockdowns and curfew periods. Since young adults are the main users of psychoactive substances for experimental and recreational purposes, this study identified and compared hospitalization trends in young adults and adults over 30 years old. METHODS This national cohort study was conducted using the French hospital discharge database. An interrupted time-series analysis for the period between 2014 and 2020 was performed in two groups: young (age 18-29) and other adults (30+) to ascertain the trends in the monthly incidence of hospitalization related to psychoactive substance intoxication (opiates, cocaine, benzodiazepines, psychostimulants, alcohol and cannabis). Hospitalization characteristics during the first and second lockdown and the period between them were compared to the reference period (from 01/01/2014 to 29/02/2020). RESULTS Among 1,358,007 stays associated with psychoactive substance intoxication, 215,430 concerned young adults. Compared with adults 30+, hospitalization trends in young adults showed a greater decrease in the number of stays during lockdown, with a maximum decrease of -39% during the first lockdown (1,566 vs. 2,576; CI95%: 2,285-2,868) versus -20% (10,212 vs. 12,894; CI95%: 12,001-13,787) in the second lockdown. Presentations for alcohol intoxication decreased throughout the pandemic, particularly during the second lockdown, while admissions for benzodiazepine intoxication increased during both lockdowns. Admissions for cannabis intoxication increased throughout the entire period. CONCLUSIONS Lockdowns were associated with fewer hospitalizations related to psychoactive substance intoxication in both age groups, especially among young adults, which might reflect a decrease in social use. Recreational use might therefore be an important target for prevention and risk minimization.
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Affiliation(s)
- J Perino
- University hospital of Bordeaux, Centre d'addictovigilance de Bordeaux, Department of medical pharmacology, Bordeaux F-33000, France; Univ. Bordeaux, INSERM, BPH, U1219, Bordeaux F-33000, France; CHU de Bordeaux, Bordeaux, France.
| | - H Ramaroson
- Unité de Coordination et d'Analyse de l'Information Médicale, Département d'Information Médicale (Ucaim-DIM), Service D'information Médicale, Chu De Bordeaux, FR, France
| | - N Ong
- Unité de Coordination et d'Analyse de l'Information Médicale, Département d'Information Médicale (Ucaim-DIM), Service D'information Médicale, Chu De Bordeaux, FR, France
| | - J Bezin
- Univ. Bordeaux, INSERM, BPH, U1219, Bordeaux F-33000, France; CHU de Bordeaux, Bordeaux, France
| | - V Gilleron
- Unité de Coordination et d'Analyse de l'Information Médicale, Département d'Information Médicale (Ucaim-DIM), Service D'information Médicale, Chu De Bordeaux, FR, France
| | - A Daveluy
- University hospital of Bordeaux, Centre d'addictovigilance de Bordeaux, Department of medical pharmacology, Bordeaux F-33000, France; Univ. Bordeaux, INSERM, BPH, U1219, Bordeaux F-33000, France
| | - M Tournier
- Univ. Bordeaux, INSERM, BPH, U1219, Bordeaux F-33000, France; Hospital Charles Perrens, Bordeaux F-33000, France
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Larrouture I, Ouattara E, Capdenat-Raymond E, Ramaroson H, Ong N, Borde A, Caridade G, Gilleron V. Parcours des personnes âgées de 75 ans et plus hospitalisées en gériatrie au CHU de Bordeaux, France. Rev Epidemiol Sante Publique 2023. [DOI: 10.1016/j.respe.2023.101514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023] Open
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Bellamy J, Broderick C, Hardy LL, Simar D, Puusepp-Benazzouz H, Ong N, Silove N. Feasibility of a school-based exercise intervention for children with intellectual disability to reduce cardio-metabolic risk. J Intellect Disabil Res 2020; 64:7-17. [PMID: 31625658 DOI: 10.1111/jir.12690] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 08/28/2019] [Accepted: 08/30/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND People with intellectual disabilities (ID) are at increased risk of secondary health conditions, reduced quality of life and life expectancy. Children with ID demonstrate low levels of physical activity in association with a higher prevalence of obesity, a modifiable risk factor associated with secondary health conditions including type 2 diabetes and cardiovascular disease. Despite this, physical activity interventions addressing weight and weight-related complications in this population are limited. This study aimed to establish the feasibility of a school-based group exercise intervention for children with moderate to severe ID. METHODS A single-arm intervention study was used to establish the feasibility of a 16-week exercise intervention. Children attending a School for Specific Purposes in Sydney, Australia, participated in two 30-min exercise sessions per week across the intervention period in addition to their regular physical education class. Each exercise session was 60% aerobically based, 20% strength based and 20% targeted towards fundamental movement skill development. We used two facilitation strategies to assist the delivery of the intervention, including the implementation of a variety of communication resources and promotion of social interaction. Feasibility was assessed through recruitment rates, program retention, adverse effects, attendance, group size feasibility and non-compliance. Anthropometric measures included height (m), weight (kg) and waist circumference (cm; umbilicus), with body mass index (BMI) and waist-to-height ratios (WtHR) used to determine cardio-metabolic risk. Aerobic capacity was assessed using the submaximal 6-min walk test (6-MWT). Intensity of physical activity sessions was measured through the use of tri-axial accelerometers and compared to physical activity recommendations. RESULTS Ten children aged between 9 and 13 years completed the 16-week intervention, with a 55% recruitment rate, 91% program retention, 86% attendance and with no adverse effects reported. Sessions commenced as 1:1 supervisor to child ratios before progressing to established small groups of 2:7 (supervisor : child). Children spent 38.4% (11.5 min) of each session in moderate to vigorous physical activity (MVPA), equating to 20% of their MVPA recommended daily physical activity levels (twice per week). There was a significant change in weight across the intervention period, with a trend towards increased weight between mid-intervention and 3-month follow-up time points. There were no significant changes in child BMI, WtHR or aerobic capacity. CONCLUSIONS A school-based group exercise intervention for children with moderate to severe ID is feasible and safe, with high retention rates and physical activity participation. No significant improvements in body composition or aerobic capacity were determined. The present study demonstrates that engaging children with moderate-severe ID in school-based group exercise is feasible to assist in physical activity participation.
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Affiliation(s)
- J Bellamy
- Faculty of Medicine, School of Medical Sciences, Department of Exercise Physiology, UNSW Sydney, New South Wales, Australia
- The Children's Hospital at Westmead, New South Wales, Australia
| | - C Broderick
- Faculty of Medicine, School of Medical Sciences, Department of Exercise Physiology, UNSW Sydney, New South Wales, Australia
- The Children's Hospital at Westmead, New South Wales, Australia
| | - L L Hardy
- Prevention Research Collaboration, The University of Sydney, New South Wales, Australia
| | - D Simar
- Faculty of Medicine, School of Medical Sciences, Department of Exercise Physiology, UNSW Sydney, New South Wales, Australia
| | | | - N Ong
- The Children's Hospital at Westmead, New South Wales, Australia
| | - N Silove
- The Children's Hospital at Westmead, New South Wales, Australia
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Saunte D, Boer J, Stratigos A, Szepietowski J, Hamzavi I, Kim K, Zarchi K, Antoniou C, Matusiak L, Lim H, Williams M, Kwon H, Gürer M, Mammadova F, Kaminsky A, Prens E, van der Zee H, Bettoli V, Zauli S, Hafner J, Lauchli S, French L, Riad H, El-Domyati M, Abdel-Wahab H, Kirby B, Kelly G, Calderon P, del Marmol V, Benhadou F, Revuz J, Zouboulis C, Karagiannidis I, Sartorius K, Hagströmer L, McMeniman E, Ong N, Dolenc-Voljc M, Mokos Z, Borradori L, Hunger R, Sladden C, Scheinfeld N, Moftah N, Emtestam L, Lapins J, Doss N, Kurokawa I, Jemec G. Diagnostic delay in hidradenitis suppurativa is a global problem. Br J Dermatol 2015. [DOI: 10.1111/bjd.14038] [Citation(s) in RCA: 183] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Aldabe B, Delmas Y, Gault G, Vendrely B, Llanas B, Charron M, Castor C, Ong N, Weill FX, Mariani-Kurkdjian P, Terrier F, Desjardin M, Simões J, Le Bihan B, Combe C, Rolland P. Household transmission of haemolytic uraemic syndrome associated with Escherichia coli O104:H4, south-western France, June 2011. Euro Surveill 2011. [DOI: 10.2807/ese.16.31.19934-en] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Following the outbreak of haemolytic uraemic syndrome (HUS) on June 2011 in south-western France, household transmission due to Escherichia coli O104:H4 was suspected for two cases who developed symptoms 9 and 10 days after onset of symptoms of the index case. The analysis of exposures and of the incubation period is in favour of a secondary transmission within the family. Recommendations should be reinforced to prevent person-to-person transmission within households.
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Affiliation(s)
- B Aldabe
- These authors contributed equally to this work
- French Institute for Public Health Surveillance (Institut de Veille Sanitaire; InVS), Regional office ‘Cire Aquitaine’, Bordeaux, France
| | - Y Delmas
- Bordeaux University Hospital, Bordeaux, France
- These authors contributed equally to this work
| | - G Gault
- French Institute for Public Health Surveillance (Institut de Veille Sanitaire; InVS), Regional office ‘Cire Aquitaine’, Bordeaux, France
| | - B Vendrely
- Bordeaux University Hospital, Bordeaux, France
| | - B Llanas
- Bordeaux University Hospital, Bordeaux, France
| | - M Charron
- French Institute for Public Health Surveillance (Institut de Veille Sanitaire; InVS), Regional office ‘Cire Aquitaine’, Bordeaux, France
| | - C Castor
- French Institute for Public Health Surveillance (Institut de Veille Sanitaire; InVS), Regional office ‘Cire Aquitaine’, Bordeaux, France
| | - N Ong
- French Institute for Public Health Surveillance (Institut de Veille Sanitaire; InVS), Regional office ‘Cire Aquitaine’, Bordeaux, France
| | - F X Weill
- Institut Pasteur, National Reference Centre for Escherichia coli and Shigella, Paris, France
| | - P Mariani-Kurkdjian
- Robert Debré Hospital, Associated Laboratory to the National Reference Centre for Escherichia coli and Shigella, Paris, France
| | - F Terrier
- Robert Picqué Military Hospital, Villenave-D’Ornon, France
| | - M Desjardin
- Robert Picqué Military Hospital, Villenave-D’Ornon, France
| | - J Simões
- Regional Health Agency of Aquitaine, Bordeaux, France
| | - B Le Bihan
- Regional Health Agency of Aquitaine, Bordeaux, France
| | - C Combe
- Both authors contributed equally to this work
- Bordeaux University Hospital, Bordeaux, France
| | - P Rolland
- Both authors contributed equally to this work
- French Institute for Public Health Surveillance (Institut de Veille Sanitaire; InVS), Regional office ‘Cire Aquitaine’, Bordeaux, France
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Aldabe B, Delmas Y, Gault G, Vendrely B, Llanas B, Charron M, Castor C, Ong N, Weill F, Mariani-Kurkdjian P, Terrier F, Desjardin M, Simoes J, Le Bihan B, Combe C, Rolland P. Household transmission of haemolytic uraemic syndrome associated with Escherichia coli O104:H4, south-western France, June 2011. Euro Surveill 2011; 16:19934. [PMID: 21871216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
Following the outbreak of haemolytic uraemic syndrome (HUS) on June 2011 in south-western France, household transmission due to Escherichia coli O104:H4 was suspected for two cases who developed symptoms 9 and 10 days after onset of symptoms of the index case. The analysis of exposures and of the incubation period is in favour of a secondary transmission within the family. Recommendations should be reinforced to prevent person-to-person transmission within households.
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Affiliation(s)
- B Aldabe
- French Institute for Public Health Surveillance (Institut de Veille Sanitaire; InVS), Regional office Cire Aquitaine , Bordeaux, France
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Gault G, Weill FX, Mariani-Kurkdjian P, Jourdan-da Silva N, King L, Aldabe B, Charron M, Ong N, Castor C, Mace M, Bingen E, Noel H, Vaillant V, Bone A, Vendrely B, Delmas Y, Combe C, Bercion R, d'Andigne E, Desjardin M, de Valk H, Rolland P. Outbreak of haemolytic uraemic syndrome and bloody diarrhoea due to Escherichia coli O104:H4, south-west France, June 2011. ACTA ACUST UNITED AC 2011; 16. [PMID: 21749817 DOI: 10.2807/ese.16.26.19905-en] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Binary file ES_Abstracts_Final_ECDC.txt matches
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Affiliation(s)
- G Gault
- Cellule interregionale d epidemiologie (CIRE) Aquitaine, France
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Matynia A, Mueller U, Ong N, Demeter J, Granger AL, Hinata K, Sazer S. Isolation and characterization of fission yeast sns mutants defective at the mitosis-to-interphase transition. Genetics 1998; 148:1799-811. [PMID: 9560394 PMCID: PMC1460064 DOI: 10.1093/genetics/148.4.1799] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
pim1-d1ts was previously identified in a visual screen for fission yeast mutants unable to complete the mitosis-to-interphase transition. pim1+ encodes the guanine nucleotide exchange factor (GEF) for the spi1 GTPase. Perturbations of this GTPase system by either mutation or overproduction of its regulatory proteins cause cells to arrest with postmitotic condensed chromosomes, an unreplicated genome, and a wide medial septum. The septation phenotype of pim1-d1ts was used as the basis for a more extensive screen for this novel class of sns (septated, not in S-phase) mutants. Seventeen mutants representing 14 complementation groups were isolated. Three strains, sns-A3, sns-A5, and sns-A6, representing two different alleles, are mutated in the pim1+ gene. Of the 13 non-pim1ts sns complementation groups, 11 showed genetic interactions with the spi1 GTPase system. The genes mutated in 10 sns strains were synthetically lethal with pim1-d1, and six sns strains were hypersensitive to overexpression of one or more of the known components of the spil GTPase system. Epistasis analysis places the action of the genes mutated in nine of these strains downstream of pim1+ and the action of one gene upstream of pim1+. Three strains, sns-A2, sns-B1, and sns-B9, showed genetic interaction with the spil GTPase system in every test performed. sns-B1 and sns-B9 are likely to identify downstream targets, whereas sns-A2 is likely to identify upstream regulators of the spi1 GTPase system that are required for the mitosis-to-interphase transition.
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Affiliation(s)
- A Matynia
- Verna and Marrs McLean Department of Biochemistry, Baylor College of Medicine, Houston, Texas 77030, USA
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Clouet P, Ong N, Bézard J. [Conversion of erucic acid in subcellular fractions from liver, kidneys and heart of rat, 8 min after intravenous injection (author's transl)]. J Physiol (Paris) 1980; 76:575-81. [PMID: 7441568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Rats were intravenously injected with albumin-bound [14 14C] erucic acid, and after 8 min the 14C radioactivity (RA) of the fatty acids were studied in mitochondria, microsomes and other fractions of liver, kidneys and heart cells. 1. In liver, which contained 15% of the injected RA, oleic acid (18 : 1) was the main fatty acid (FA) formed (26% of the 14C recovered) whereas in kidneys (0,53% of the injected RA) the proportion of nervonic acid (24 : 1) was higher (20%) than that of 18 : 1 (14%). No appreciable transformation was encountered in heart, which contained 0,53% of the injected RA. 2. In liver, the microsomes showed the higher converted 14C RA (45%), mainly as 18 : 1 (33%), much higher than in mitochondria (11%), whereas the amount of total 14C FA was a little higher in the latter fraction. 3. In kidneys, the mitochondrial and microsomal fractions contained the same percentage of 14C oleic acid (15%), whereas nervonic acid was recovered in higher proportion, 29 and 20%, in microsomes and in mitochondria respectively. 4. Results show that the same kind of metabolic activity, i.e., shortening or elongation, was observed in the whole cell as that previously shown with isolated fractions. However, mitochondrial oxidation and exchanges of transformed fatty acids between organelles can modify the extent of the phenomenon.
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Ong N, Bezard J, Lecerf J. Incorporation and metabolic conversion of erucic acid in various tissues of the rat in short term experiments. Lipids 1977; 12:563-9. [PMID: 895405 DOI: 10.1007/bf02533382] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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