Upton Allen

ORCID: 0000-0002-2326-7731
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About
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Research Areas
  • Respiratory viral infections research
  • Cytomegalovirus and herpesvirus research
  • Viral-associated cancers and disorders
  • Polyomavirus and related diseases
  • Influenza Virus Research Studies
  • Parvovirus B19 Infection Studies
  • Pneumonia and Respiratory Infections
  • Herpesvirus Infections and Treatments
  • Streptococcal Infections and Treatments
  • Pneumocystis jirovecii pneumonia detection and treatment
  • SARS-CoV-2 and COVID-19 Research
  • Neutropenia and Cancer Infections
  • Lymphoma Diagnosis and Treatment
  • COVID-19 Clinical Research Studies
  • Viral gastroenteritis research and epidemiology
  • Antifungal resistance and susceptibility
  • HIV/AIDS Research and Interventions
  • Antibiotics Pharmacokinetics and Efficacy
  • COVID-19 and Mental Health
  • Fungal Infections and Studies
  • Vaccine Coverage and Hesitancy
  • Congenital Diaphragmatic Hernia Studies
  • Neonatal and Maternal Infections
  • Transplantation: Methods and Outcomes
  • Sepsis Diagnosis and Treatment

University of Toronto
2016-2025

Hospital for Sick Children
2016-2025

SickKids Foundation
2016-2025

Institute for Clinical Evaluative Sciences
2008-2025

Research Network (United States)
2024

Children's Hospital of Eastern Ontario
1993-2022

University College London
2013-2022

Great Ormond Street Hospital
2013-2022

Western University
2021-2022

London Health Sciences Centre
2022

These updated guidelines from the American Society of Transplantation Infectious Diseases Community Practice review diagnosis, management, and prevention post-transplant lymphoproliferative disorders (PTLD) other Epstein-Barr virus (EBV) syndromes after solid organ transplantation. PTLD are a heterogeneous spectrum predominantly B-cell disorders, often extra-nodal, with complex distinct pathogeneses variable clinical presentations determined by pathologic subtype. Recent epidemiologic...

10.1111/ctr.13652 article EN Clinical Transplantation 2019-06-23

<b>Background:</b> Limited data are available on disease characteristics and outcomes of children with 2009 pandemic influenza A(H1N1) virus infection (pandemic H1N1 influenza) who have required hospital admission. <b>Methods:</b> We reviewed the charts 58 admitted to a large pediatric in Ontario, Canada, between May 8 July 22, 2009. compared risk factors, severity indicators these those 200 seasonal A during previous 5 years (2004/05 2008/09). <b>Results:</b> Children were significantly...

10.1503/cmaj.091724 article EN cc-by-nc-nd Canadian Medical Association Journal 2009-11-19

Background: Infants born at 33 through 35 completed weeks of gestation (33-35GA) are risk for severe respiratory syncytial virus (RSV) infection, and palivizumab prophylaxis lowers hospitalizations RSV infection by as much 80%. The 33-35GA cohort comprises 3-5% annual births; thus expert panels recommend limiting to situations in which frequency or health care impact is high. This study sought identify independent factors hospitalization infection. Methods: was a multicenter, prospective,...

10.1097/01.inf.0000137568.71589.bd article EN The Pediatric Infectious Disease Journal 2004-09-01

Posttransplant lymphoproliferative disorder (PTLD) is recognized as potentially one of the most devastating complications organ transplantation. Epstein-Barr virus (EBV) associated with majority PTLD cases. The entity referred to EBV-associated encompasses a wide spectrum clinical conditions characterized by lymphoproliferation after These syndromes range from uncomplicated infectious mononucleosis true malignancies (1–3). Disease may be nodal or extranodal, localized, often in allograft,...

10.1111/j.1600-6143.2009.02898.x article EN cc-by-nc-nd American Journal of Transplantation 2009-12-01

During a 4-year period 4684 nosocomial infections occurred in university pediatric hospital which admitted 78,120 patients (nosocomial infection rate (NIR) = 6.0). NIR varied from 0.17 to 14.0 on different wards or services; the highest rates (greater than equal 5.6) were found Neonatal Intensive Care Unit, infant neurosurgery, hematology/oncology, neonatal surgery, cardiology/cardiovascular Pediatric Unit and infant/toddler medicine areas. Infections most common less 23 months (NIR 11.5),...

10.1097/00006454-198910000-00002 article EN The Pediatric Infectious Disease Journal 1989-10-01

These recommendations provide a data-supported approach to establishing guidelines. They are based on the following: (1) formal review and analysis of recently published world literature topic (via PubMed/MEDLINE search from 1996 July 2011 limited English language, human studies, children 0-18 years old); (2) A Manual for Assessing Health Practices Designing Practice Guidelines American College Physicians1; (3) guideline policies, including Association Study Liver Diseases policy development...

10.1002/lt.23697 article EN Liver Transplantation 2013-07-09

Novel influenza A/H1N1 virus has caused significant illness worldwide. In response to this global crisis, the American Society of Transplantation (AST) Infectious Diseases Community Practice and Transplant section The (TTS) developed a guidance document for novel H1N1. paper, we discuss current H1N1 as it relates solid organ transplantation. We include discussion around clinical presentation, diagnosis, therapy prevention specifically addressing areas such chemoprophylaxis, immunization...

10.1111/j.1600-6143.2009.02960.x article EN cc-by-nc-nd American Journal of Transplantation 2009-12-02

Routine use of pulse oximetry has been associated with changes in bronchiolitis management and may have lowered the hospitalization threshold for patients bronchiolitis.To examine if infants whose displayed measurements artificially elevated 3 percentage points above true values experience rates at least 15% lower compared displayed.Randomized, double-blind, parallel-group trial conducted from 2008 to 2013 a tertiary-care pediatric emergency department Toronto, Ontario, Canada. Participants...

10.1001/jama.2014.8637 article EN JAMA 2014-08-19

Abstract Growing evidence suggests receipt of live‐attenuated viral vaccines after solid organ transplant (SOT) has occurred and is safe needed due to lapses in herd immunity. A 2‐day consortium experts infectious diseases, transplantation, vaccinology, immunology was held with the objective review create expert recommendations for clinicians when considering live post‐SOT. For consideration VV MMR post‐transplant, exists only kidney liver recipients. vaccine post‐SOT, consider vaccination...

10.1111/petr.13571 article EN Pediatric Transplantation 2019-09-09

A randomised double blind trial was conducted to determine the efficacy of inhaled bronchodilators, salbutamol and ipratropium bromide, compared with placebo in treatment bronchiolitis. Patients, who were 2 months years age without underlying cardiac or pulmonary disease, received drug 1 (salbutamol saline placebo) followed one hour later by (ipratropium bromide placebo). Both agents administered every four hours. The patients allocated groups according a factorial design. similar...

10.1136/adc.67.3.289 article EN Archives of Disease in Childhood 1992-03-01

Background. Lopinavir/ritonavir has demonstrated antiviral activity in the HIV-infected adult. Subjects. The objective of this study was to investigate a liquid coformulation lopinavir/ritonavir, combination with reverse transcriptase inhibitors, children. Methods. One hundred antiretroviral (ARV)-naive and ARV-experienced, nonnucleoside inhibitor-naive children between 6 months 12 years age participated Phase I/II, open label, multicenter trial. Subjects initially received either 230/57.5...

10.1097/01.inf.0000055061.97567.34 article EN The Pediatric Infectious Disease Journal 2003-03-01
Nadia Roumeliotis Matthew Carwana Ofélie Trudeau Katia Charland Kate Zinszer and 95 more Mike Benigeri Mamadou Diop Jesse Papenburg Samina Ali Maryna Yaskina Gita Wahi Baudouin Forgeot d’Arc Sylvana M. Côté Manish Sadarangani Nicole E. Basta Patrícia S. Fontela Soren Gantt Terry P. Klassen Caroline Quach Quynh Doan Sarah Ahira Upton Allen Krista Baerg Megan Bale-Nick Ananya Tina Banerjee Michelle Barton Darcy Beer Simon Berthelot Julie A. Bettinger Maala Bhatt Melanie Buba Francine Buchanan Jared Bullard Brett Burstein Catherine Burton Rahul Chanchlani Michaël Chassé Karen Choong Evelyn Constantin Cora Constantinescu Carrie Costello Tammie Dewan Tanya Di Genova Olivier Drouin Karen Dryden‐Palmer Geneviève Du Pont- Thibodeau Marc-André Dugas Raven Dumont-Maurice Guillaume Émériaud Jason G. Emsley Mark A. Ferro Karen Forbes Isabel Fortier Jennifer Foster Jessica Foulds Stephen B. Freedman Gabrielle Freire Eleni Galanis P. Grantley Gill Jocelyn Gravel Emily Gruenwoldt Gonzalo Garcia Guerra Astrid Guttman Betty Jean Hancock Robyn Harrison Joanna Holland Ari R. Joffe Fatima Kakkar April Kam James D. Kellner Lisa Knisley Thierry Lacaze‐Masmonteil Saptharishi Lalgudi Ganesan Marc- André Langlois Nicole Le Saux Laurie Lee Kirk Leifso Patricia Li Andrea Linares Sanjay Mahant Isabelle Marc Ahmed Mater James McNally Garth Meckler Shaun Morris Haifa Mtaweh Srinivas Murthy Fiona Muttalib Leigh Anne Newhook Jessica Nicoll Nathalie Orr-Gaucher Joseph S. Pagano Anna Pangilinan Jeffrey M. Pernica Naveen Poonai Élodie Portales-Casamar Robert Porter Rupeena Purewal Paula Robeson Joan Robinson

Importance The COVID-19 pandemic resulted in multiple socially restrictive public health measures and reported negative mental impacts youths. Few studies have evaluated incidence rates by sex, region, social determinants across an entire population. Objective To estimate the of hospitalizations for conditions, stratified determinants, children adolescents (hereinafter referred to as youths ) young adults comparing prepandemic pandemic-prevalent periods. Design, Setting, Participants This...

10.1001/jamanetworkopen.2024.22833 article EN cc-by-nc-nd JAMA Network Open 2024-07-08

Objective. An outbreak of severe acute respiratory syndrome (SARS) occurred in the greater Toronto area between February and June 2003. We describe clinical, laboratory, epidemiologic features children who were admitted to Hospital for Sick Children, Toronto, with a presumptive diagnosis suspect or probable SARS. Methods. A prospective investigational study protocol was established management All ultimately classified as having SARS, another cause on basis their exposure, clinical radiologic...

10.1542/peds.112.4.e261 article EN PEDIATRICS 2003-10-01

After organ transplant, patients are at risk of posttransplant lymphoproliferative disorders (PTLD). The purpose this study was to analyze 26 pediatric cases PTLD observed our institution between 1988 and 1996, evaluate the validity Society for Hematopathology Workshop (SHPW) 1997 classification in patient population.Charts were reviewed analysis incidence, clinical course, outcome. Tissue samples classified by a pathologist according SHPW recommendations.By morphology, 20 monomorphic, 5...

10.1097/00007890-199904150-00010 article EN Transplantation 1999-04-01

Abstract: Post‐transplant Lymphoproliferative Disorder (PTLD) because of the Epstein–Barr Virus (EBV) is a major concern after pediatric transplantation. The group at greatest risk EBV‐seronegative recipients who receive EBV‐seropositive organs. Additional factors remain to be determined, including those among recipients. In this case‐control study, PTLD cases were biopsy‐proven over period 4 yr (1997–2000, inclusive). Each case was matched with 2 controls, based on type organ transplanted...

10.1111/j.1399-3046.2005.00318.x article EN Pediatric Transplantation 2005-07-27

Background. Transplant recipients who are Epstein-Barr virus (EBV)-seronegative and receive organs from seropositive donors (EBV D+/R−) at increased risk for posttransplant lymphoproliferative disorder (PTLD) may benefit antiviral prophylaxis. We performed a multi-center trial assessing two different regimens their effect on EBV replication. Methods. D+/R− solid organ transplant were randomized to either ganciclovir placebo or immunoglobulin (IG) 3 months. Following this, patients unblinded...

10.1097/01.tp.0000202724.07714.a2 article EN Transplantation 2006-03-27
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