Research Topics
| A HumarSummaryAffiliation: University of Alberta Country: Canada Publications
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Publications
Changes in the spectrum and risk factors for invasive candidiasis in liver transplant recipients: prospective, multicenter, case-controlled studyShahid Husain
University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
Transplantation 75:2023-9. 2003..Routine use of antifungal prophylaxis warrants concern given the emergence of non-albicans Candida spp. as significant pathogens after liver transplantation and higher mortality in patients with these infections...
Clinical utility of cytomegalovirus (CMV) serology testing in high-risk CMV D+/R- transplant recipientsAtul Humar
University of Toronto, Toronto, Ontario, Canada
Am J Transplant 5:1065-70. 2005..002). In D+/R- patients, CMV serology testing is for the most part not clinically useful for predicting subsequent disease. However, seroconversion by 6 months may be useful for identifying patients at risk of late-onset CMV disease...
An assessment of interactions between hepatitis C virus and herpesvirus reactivation in liver transplant recipients using molecular surveillanceAtul Humar
Department of Medicine, University of Alberta, Edmonton, AB, Canada
Liver Transpl 13:1422-7. 2007..HCV-negative patients (47.6% vs. 72.7%; P=0.006). In conclusion, these results suggest that HCV infection does not appear to promote herpesvirus reactivation after liver transplantation...
Differential decay kinetics of human cytomegalovirus glycoprotein B genotypes following antiviral chemotherapyVincent C Emery
Centre for Virology, Department of Infection, University College Medical School, London, United Kingdom
J Clin Virol 54:56-60. 2012..The impact of different cytomegalovirus (HCMV) glycoprotein B (gB) genotypes on pathogenesis remains controversial...
An assessment of herpesvirus co-infections in patients with CMV disease: correlation with clinical and virologic outcomesA Humar
Department of Medicine, University of Alberta, Edmonton, AB, Canada
Am J Transplant 9:374-81. 2009..Routine monitoring for viral co-infection in patients with CMV disease is not indicated...
Nucleic acid testing (NAT) of organ donors: is the 'best' test the right test? A consensus conference reportA Humar
Transplant Infectious Diseases, University of Alberta
Am J Transplant 10:889-99. 2010..Further study of viral screening modalities may reduce disease transmission risk without excessive donor loss...
The efficacy and safety of 200 days valganciclovir cytomegalovirus prophylaxis in high-risk kidney transplant recipientsA Humar
Department of Medicine, University of Alberta, Edmonton, AB, Canada
Am J Transplant 10:1228-37. 2010..The number needed to treat to avoid one additional patient with CMV disease up to 12 months posttransplant is approximately 5...
Extended valganciclovir prophylaxis in D+/R- kidney transplant recipients is associated with long-term reduction in cytomegalovirus disease: two-year results of the IMPACT studyAtul Humar
Transplant Infectious Diseases, University of Alberta, Edmonton, AB, Canada
Transplantation 90:1427-31. 2010..Whether the early reduction in cytomegalovirus (CMV) disease seen at 1 year with prolongation of antiviral prophylaxis (up to 200 days) persists in the long term is unknown...
Analysis and clinical correlation of genetic variation in cytomegalovirusL F Lisboa
Transplant Infectious Diseases, University of Alberta, Edmonton, Alberta, Canada
Transpl Infect Dis 14:132-40. 2012..We aimed to characterize the molecular epidemiology of gN and IE1 genotypes in organ transplant patients with CMV disease in the context of clinical and virologic endpoints...
Cell-mediated immunity to predict cytomegalovirus disease in high-risk solid organ transplant recipientsD Kumar
Transplant Infectious Diseases, University of Alberta, Edmonton, Alberta, Canada
Am J Transplant 9:1214-22. 2009..0%) patients with a detectable interferon-gamma response (cutoff 0.1 IU/mL) versus 10/25 (40.0%) patients with a negative CMI, p = 0.12. Monitoring of CMI may be useful for predicting late-onset CMV disease...
Late cytomegalovirus transmission and impact of T-depletion in clinical islet transplantationB L Gala-Lopez
Clinical Islet Transplant Program, University of Alberta, Edmonton, Alberta, Canada
Am J Transplant 11:2708-14. 2011..Therefore, CMV transmission presents rarely after IT and with low incidence compared to solid organ transplantation, but occurs late posttransplant. The use of lymphocyte depleting therapies is a primary risk factor...
Human herpesvirus-6 is associated with cytomegalovirus reactivation in liver transplant recipientsA Humar
Department of Medicine, Division of Infectious Diseases and Multi Organ Transplantation, Toronto General Hospital University Health Network, Toronto, Ontario M5G 2C4, Canada
J Infect Dis 181:1450-3. 2000..013; odds ratio, 7.26; 95% confidence interval, 1.52-34.72). HHV-6 is associated with CMV infection and disease, thus supporting an interaction between these viruses...
Guidance on novel influenza A/H1N1 in solid organ transplant recipientsD Kumar
Transplant Infectious Diseases, University of Alberta, Edmonton, Alberta, Canada
Am J Transplant 10:18-25. 2010..As new information emerges about novel H1N1, updates will be made to the electronic version of the document posted on the websites of the AST and TTS...
A randomised trial comparing cytomegalovirus antigenemia assay vs screening bronchoscopy for the early detection and prevention of disease in allogeneic bone marrow and peripheral blood stem cell transplant recipientsA Humar
Department of Medicine, Division of Infectious Diseases, Toronto General Hospital-University Health Network, 200 Elizabeth Street, Toronto, Ontario M5G 2C4, Canada
Bone Marrow Transplant 28:485-90. 2001..Preemptive therapy based on regular CMV antigenemia monitoring is superior to screening bronchoscopy for the prevention of CMV disease after allogeneic BMT...
Comparison of quantiferon-TB gold with tuberculin skin test for detecting latent tuberculosis infection prior to liver transplantationO Manuel
Transplant Infectious Diseases, and Microbiology, University of Alberta, Edmonton, Alberta, Canada
Am J Transplant 7:2797-801. 2007..In patients awaiting liver transplantation, both the TST and QFT-G were comparable for the diagnosis of LTBI with reasonable concordance between tests. Indeterminate QFT-G result was more likely in those with more advanced liver disease...
A randomized, double-blind trial of pneumococcal vaccination in adult allogeneic stem cell transplant donors and recipientsDeepali Kumar
Transplant Infectious Diseases, University of Alberta, Edmonton, Alberta, Canada
Clin Infect Dis 45:1576-82. 2007..Pneumococcal conjugate vaccine (PCV7) may improve immunogenicity in this population, and a donor vaccination strategy may benefit patients undergoing HSCT...
Incidence and clinical characteristics of herpes zoster after lung transplantationOriol Manuel
Department of Transplant Infectious Diseases, University of Alberta, Edmonton, Alberta, Canada
J Heart Lung Transplant 27:11-6. 2008..Epidemiologic data in lung transplant recipients are lacking. We determined the incidence and clinical characteristics of herpes zoster, and the risk factors for developing herpes zoster, after lung transplantation...
Lack of association between beta-herpesvirus infection and bronchiolitis obliterans syndrome in lung transplant recipients in the era of antiviral prophylaxisOriol Manuel
Transplant Infectious Diseases, University of Alberta, Edmonton, AB, Canada
Transplantation 87:719-25. 2009..We assessed the contribution of these viruses in the development of bronchiolitis obliterans syndrome (BOS) after lung transplantation...
A randomized, double-blind, placebo-controlled trial to evaluate the prime-boost strategy for pneumococcal vaccination in adult liver transplant recipientsDeepali Kumar
Transplant Infectious Diseases, University of Alberta, Edmonton, Canada
Clin Infect Dis 47:885-92. 2008..It may be possible to enhance immunogenicity by priming the recipient with the 7-valent pneumococcal conjugate vaccine (PCV7), followed by boosting with PPV23...
Interactions between cytomegalovirus, human herpesvirus-6, and the recurrence of hepatitis C after liver transplantationAtul Humar
Department of Medicine, Multi Organ Transplantation, Toronto General Hospital, University Health Network, Department of Microbiology, University of Toronto, Toronto, Canada
Am J Transplant 2:461-6. 2002..031). In conclusion, HHV-6 and CMV infection and viral load were not associated with increased overall rates of HCV recurrence or HCV viral load after liver transplantation but may be associated with more severe forms of recurrence...
A prospective molecular surveillance study evaluating the clinical impact of community-acquired respiratory viruses in lung transplant recipientsDeepali Kumar
Transplant Infectious Diseases, University of Alberta, Edmonton, Alberta, Canada
Transplantation 89:1028-33. 2010..The use of sensitive molecular methods that can simultaneously detect a large panel of respiratory viruses may help better define their effects...
Respiratory viral infections in transplant and oncology patientsDeepali Kumar
Department of Medicine, Transplant Infectious Diseases, University of Alberta, 6 030 Katz Rexall Center for Health Research, Edmonton, Alberta T6G 2E1, Canada
Infect Dis Clin North Am 24:395-412. 2010..This article describes the current knowledge about respiratory viral infections as it relates to solid organ transplant, hematopoietic stem cell transplant, and oncology settings...
Successful bilateral lung transplantation in a patient with end-stage lung disease and positive novel influenza virus (H1N1)Mohammed M Al Aklabi
Division of Cardiac Surgery, Heart and Lung Transplantation, University of Alberta, Edmonton, Alberta, Alberta, Canada
J Heart Lung Transplant 29:898-9. 2010..He received three-weeks of antiviral treatment post-operatively and he had uneventful procedure with favorable outcome...
Outcomes from pandemic influenza A H1N1 infection in recipients of solid-organ transplants: a multicentre cohort studyDeepali Kumar
University of Alberta, Edmonton, AB, Canada
Lancet Infect Dis 10:521-6. 2010..We aimed to establish the outcomes of pandemic influenza A H1N1 and factors leading to severe disease in a cohort of patients who had received transplants...
Early post-transplant vaccination with pandemic influenza A/H1N1 vaccine in pediatric heart transplant recipientsLuis Altamirano-Diaz
Pediatric Heart Transplant, Stollery Children s Hospital, Transplant Infectious Diseases, University of Alberta, Edmonton, AB, Canada
Pediatr Transplant 15:172-5. 2011..Three of five developed protective titers against H1N1. A proportion of pediatric patients may respond to influenza vaccine even when immunized in the early post-transplant period...
Lung transplantation for severe antineutrophilic cytoplasmic antibody-associated vasculitisJ Weinkauf
Department of Medicine, University of Alberta, Edmonton, Canada
Transplant Proc 42:2707-10. 2010..Herein, we report successful lung transplantation for a patient with life-threatening pulmonary hemorrhage and respiratory failure as a consequence of this pulmonary renal syndrome...
Pneumocystis jirovecii pneumonia after rituximab therapy for antibody-mediated rejection in a renal transplant recipientD Kumar
Transplant Infectious Diseases, Division of Infectious Diseases, University of Alberta, Edmonton, Alberta, Canada
Transpl Infect Dis 11:167-70. 2009..After therapy with rituximab, she developed Pneumocystis jirovecii pneumonia (PJP) requiring hospitalization. We discuss the increasing literature for the use of rituximab for AMR and the need for PJP prophylaxis in this setting...
Reactivation of viruses in solid organ transplant patients receiving cytomegalovirus prophylaxisAtul Humar
Transplant Infectious Diseases, Division of Infectious Diseases, Toronto General Hospital, Toronto, Ontario, Canada
Transplantation 82:S9-S14. 2006..CMV prophylaxis may have modified the natural history of some of these non-CMV viral infections...
Assessment of adenovirus infection in adult lung transplant recipients using molecular surveillanceAtul Humar
Department of Medicine, University of Toronto, Toronto, Ontario, Canada
J Heart Lung Transplant 25:1441-6. 2006..Little is known about adenovirus infections in adult lung transplant recipients. Because the virus can establish latency, re-activation may be relatively common after transplantation...
Cytomegalovirus (CMV) virus load kinetics to predict recurrent disease in solid-organ transplant patients with CMV diseaseAtul Humar
Department of Medicine, Division of Infectious Diseases and Multi Organ Transplantation, Toronto, Canada
J Infect Dis 186:829-33. 2002..17 days among patients without recurrence (P=.001). This was not explainable by detectable ganciclovir resistance. CMV load kinetics are useful for identifying, at a very early stage, patients who are more likely to have recurrence...
Invasive pneumococcal disease in adult hematopoietic stem cell transplant recipients: a decade of prospective population-based surveillanceD Kumar
Division of Infectious Diseases, University of Alberta, Edmonton, Alberta, Canada
Bone Marrow Transplant 41:743-7. 2008..The antimicrobial resistance rates were high, especially for trimethoprim/sulfamethoxazole. HSCT recipients are at significantly greater risk for IPD than the general population. Preventative strategies are necessary...
Cytomegalovirus (CMV) glycoprotein B genotypes and response to antiviral therapy, in solid-organ-transplant recipients with CMV diseaseAtul Humar
Department of Medicine, Division of Multi Organ Transplantation, Toronto General Hospital, University Health Network, University of Toronto, Toronto, Ontario, Canada
J Infect Dis 188:581-4. 2003..It appears that the gB genotype, which causes CMV disease, does not significantly influence CMV-load kinetics or clinical response to therapy...
Methicillin-resistant Staphylococcus aureus infection after lung transplantation: 5-year review of clinical and molecular epidemiologyOriol Manuel
Transplant Infectious Diseases, University of Alberta, Edmonton, Alberta, Canada
J Heart Lung Transplant 28:1231-6. 2009..Data on the epidemiology of MRSA infection in lung transplantation is limited...
An assessment of donor-to-recipient transmission patterns of human cytomegalovirus by analysis of viral genomic variantsOriol Manuel
Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
J Infect Dis 199:1621-8. 2009..We studied human cytomegalovirus (CMV) donor-to-recipient transmission patterns in organ transplantation by analyzing genomic variants on the basis of CMV glycoprotein B (gB) genotyping...
Donor-derived bacteremia in liver transplant recipients despite antibiotic prophylaxisK E Doucette
Transplant Infectious Diseases, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
Am J Transplant 13:1080-3. 2013..As no transmissions occurred in recipients of nonhepatic organs from these donors, these cases also suggest that liver recipients may be at higher risk of donor transmitted bacteremia...
Elimination of an outbreak of gram-negative bacteremia in a hemodialysis unitA Humar
Department of Medicine, Ottawa General Hospital, Ontario, Canada
Am J Infect Control 24:359-63. 1996..All dialysis tubing was to be disinfected before patient connection. CONCLUSION: Outbreak was due to contamination during dialysis setup. After institution of appropriate control measures, no new cases have occurred...
Predictors of virological response in HIV-infected patients to salvage antiretroviral therapy that includes nelfinavirS L Walmsley
The Toronto Hospital Immunodeficiency Clinic, Department of Medicine, University of Toronto, Ontario, Canada
Antivir Ther 6:47-54. 2001..Response rates were lower in patients with increasing numbers of primary (P=0.045) or secondary (P=0.001) PI mutations. The addition of increasing numbers of reverse transcriptase mutations further impaired response rates (P=0.004)...
Immunogenicity and safety of an intradermal boosting strategy for vaccination against influenza in lung transplant recipientsO Manuel
Transplant Infectious Diseases, University of Alberta, Edmonton, Alberta, Canada
Am J Transplant 7:2567-72. 2007..024). After a single standard dose of influenza vaccine, a booster dose given by intradermal injection did not significantly improve vaccine immunogenicity in lung transplant recipients...
Impact of genetic polymorphisms in cytomegalovirus glycoprotein B on outcomes in solid-organ transplant recipients with cytomegalovirus diseaseOriol Manuel
Transplant Infectious Diseases and Provincial Laboratory for Public Health Microbiology, University of Alberta, Edmonton, Alberta, Canada
Clin Infect Dis 49:1160-6. 2009..Polymorphisms in the CMV glycoprotein B (gB) gene allow discrimination of 4 distinct genotypes (gB1-gB4). We assessed the influence of gB genotypes on the clinical and virologic outcome of CMV disease...
An international survey of cytomegalovirus management practices in lung transplantationDalyce M Zuk
Lung Transplant Program, University of Alberta, Edmonton, Alberta, Canada
Transplantation 90:672-6. 2010..Cytomegalovirus (CMV) is an important infection in lung transplant recipients. Center-to-center variation in preventive and treatment strategies is unknown...
Travel patterns and risk behavior in solid organ transplant recipientsAndrea K Boggild
University of Toronto, Division of Infectious Diseases, Department of Medicine, UHN-Toronto General Hospital, Toronto, ON, Canada
J Travel Med 11:37-43. 2004..CONCLUSIONS: Solid organ transplant recipients represent a unique group of compromised travelers; however, few were adequately protected against travel-associated enteric, vector-borne and bloodborne pathogens...
Concurrent genotyping and quantitation of cytomegalovirus gB genotypes in solid-organ-transplant recipients by use of a real-time PCR assayXiaoli Pang
Provincial Laboratory for Public Health Microbiology, University of Alberta Hospital, Edmonton, AB, Canada
J Clin Microbiol 46:4004-10. 2008..78%). With the prominent feature of concurrent CMV gB genotyping and quantitation in a single reaction, the new assay provides a rapid and cost-effective method for monitoring CMV infection in SOT recipients...
Emerging viral infections in transplant recipientsDeepali Kumar
Transplant Infectious Diseases, University of Toronto, Toronto, Ontario, Canada
Curr Opin Infect Dis 18:337-41. 2005..Lessons learned from West Nile virus and severe acute respiratory syndrome in transplantation should be applicable to future outbreaks of other emerging infectious diseases...
Clinical impact of human herpesvirus 6 infection after liver transplantationAtul Humar
Toronto General Hospital, Toronto, Ontario, Canada, M5G 2C4
Transplantation 73:599-604. 2002..The objective of this study was to determine the clinical impact of HHV-6 infection after liver transplantation including both direct and indirect effects...
Cytomegalovirus glycoprotein B genotype does not correlate with outcomes in liver transplant patientsLisa Sarcinella
Department of Microbiology, Mount Sinai Hospital, University of Toronto, 600 University Avenue, Toronto, Ont, Canada M5G 1X5
J Clin Virol 24:99-105. 2002..030). CONCLUSIONS: The gB genotype did not correlate with peak CMV viral load and with the development of CMV disease or acute rejection following liver transplantation...
Randomized, double-blind, controlled trial of pneumococcal vaccination in renal transplant recipientsDeepali Kumar
The Immunocompromised Host Infection Service, Division of Multi Organ Transplant and Infectious Diseases, University of Toronto, Toronto, Canada
J Infect Dis 187:1639-45. 2003..09). The response rate and mean fold increase in OPA titers were not significantly different between groups. There was a trend toward enhanced immunogenicity for PCV7 by ELISA. However, functional antibody responses were not different...
Mycobacterium abscessus infections in lung transplant recipients: the international experienceSusan M Chernenko
Toronto Lung Transplant Program, University Health Network, University of Toronto, Toronto, Ontario, Canada
J Heart Lung Transplant 25:1447-55. 2006..Concurrent infections are common and may contribute to mortality in this immunosuppressed population...
Severe Acute Respiratory Syndrome (SARS) in a liver transplant recipient and guidelines for donor SARS screeningDeepali Kumar
Infectious Diseases and Multi-Organ Transplant, University Health Network, University of Toronto, Ontario, Canada
Am J Transplant 3:977-81. 2003..As SARS spreads throughout the world, it may become an increasingly significant problem for transplant patients and programs...
A report of the Lisbon Conference on the care of the kidney transplant recipientMario Abbud-Filho
Instituto de Urologia e Nefrologia and Medical School - FAMERP, , Brazil
Transplantation 83:S1-22. 2007
Efficacy and safety of valganciclovir vs. oral ganciclovir for prevention of cytomegalovirus disease in solid organ transplant recipientsCarlos Paya
Mayo Clinic, Rochester, MN, USA
Am J Transplant 4:611-20. 2004..2%, vs 3.2% ganciclovir) the safety profile was similar for both drugs. Overall, once-daily oral valganciclovir was as clinically effective and well-tolerated as oral ganciclovir tid for CMV prevention in high-risk SOT recipients...
Pharmacodynamics of oral ganciclovir and valganciclovir in solid organ transplant recipientsHugh Wiltshire
Roche Products, Welwyn Garden City, Herts, UK
Transplantation 79:1477-83. 2005..CONCLUSIONS: The greater systemic exposure to ganciclovir delivered by valganciclovir was associated with delayed development of viremia. There was only a weak association between AUC and hematological toxicity...
A surveillance study of adenovirus infection in adult solid organ transplant recipientsAtul Humar
University of Toronto, Toronto, Ontario, Canada
Am J Transplant 5:2555-9. 2005..No serious clinical sequelae or effects on subsequent acute rejection were observed...
A trial of valganciclovir prophylaxis for cytomegalovirus prevention in lung transplant recipientsAtul Humar
Department of Infectious Disease and Transplantation, University of Toronto, Ontario, Canada
Am J Transplant 5:1462-8. 2005..Valganciclovir prophylaxis had similar efficacy to either intravenous ganciclovir (D+/R- patients), or oral ganciclovir (R+ patients) in lung recipients...
Herpesvirus infections in solid organ transplant patients at high risk of primary cytomegalovirus diseaseRaymund R Razonable
Division of Infectious Diseases, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA
J Infect Dis 192:1331-9. 2005..Compared with historic data, data from the present study suggest that antiviral prophylaxis may lower the incidence, prevalence, or level of DNAemia for infection with HHV-6, HHV-8, VZV, and EBV but not for infection with HHV-7...
Risk factors for cytomegalovirus viremia and disease developing after prophylaxis in high-risk solid-organ transplant recipientsRichard B Freeman
New England Medical Center of Transplant Surgery, Boston, MA 2 Mayo Clinic, Rochester, MN 02111, USA
Transplantation 78:1765-73. 2004..Cytomegalovirus (CMV) D+/R- solid-organ transplant (SOT) recipients carry increased risk of developing CMV disease; however, other risk factors in these patients have not been delineated...
A randomized trial of ganciclovir versus ganciclovir plus immune globulin for prophylaxis against Epstein-Barr virus related posttransplant lymphoproliferative disorderAtul Humar
Transplant Infectious Diseases, University of Toronto, and University Health Network, Toronto General Hospital, 585 University Avenue, Toronto, Ontario, Canada M5G 2N2
Transplantation 81:856-61. 2006..We performed a multi-center trial assessing two different antiviral regimens and their effect on EBV replication...
Absence of cytomegalovirus-resistance mutations after valganciclovir prophylaxis, in a prospective multicenter study of solid-organ transplant recipientsGuy Boivin
Research Center in Infectious Diseases, Centre Hospitalier Universitaire de Quebec and Laval University, Quebec City, Canada
J Infect Dis 189:1615-8. 2004..Valganciclovir was associated with negligible risk of resistance and thus constitutes a useful alternative to ganciclovir prophylaxis for CMV in high-risk SOT recipients...
Clinical utility of cytomegalovirus viral load testing for predicting CMV disease in D+/R- solid organ transplant recipientsAtul Humar
University Health Network, Toronto General Hospital, Toronto ON, Canada
Am J Transplant 4:644-9. 2004..Similarly, single time point measures at the end of prophylaxis or month 4 had low sensitivity for disease prediction. Overall, regular CMV plasma viral load measurements were only of modest value in predicting CMV disease...
A prospective assessment of valganciclovir for the treatment of cytomegalovirus infection and disease in transplant recipientsAtul Humar
Division of Infectious Diseases and Multi Organ Transplant Program, University of Toronto, Toronto, Canada
J Infect Dis 192:1154-7. 2005..Two patients treated with valganciclovir required a switch to iv ganciclovir, because of a lack of response. Valganciclovir is useful for the treatment of CMV infection and disease in selected organ-transplant recipients...
