View clinical trials related to Cytomegalovirus Infections.
Filter by:Viral infections remain an important cause of morbidity and mortality after allogeneic stem cell transplantation (SCT), especially after myelo-ablative conditioning and if the donor is antigen-mismatched or haplo-identical.. In the described setting the patient's own immune system has been destroyed by the necessary highly immuno- and myelo-ablative conditioning and all memory against infections has been deleted. Therefore, there is a high risk for several viral infections and other infectious organisms.Both primary viral infections and reactivations can occur, and patients can become refractory to antiviral treatments, or in some cases an adequate antiviral treatment is unavailable or too toxic. In this study, the investigators will target CMV, as refractory CMV infection and disease is accompanied by an extremely high mortality rate and therefore the development of new treatment approaches is required. Despite the available antiviral drugs, a considerable number of patients are facing an insufficient control of CMV reactivation after SCT. Because reconstitution of CMV-specific T cells confer protection against the development of CMV disease after SCT, attempts have been made to restore antiviral immunity by direct infusion of CMV-specific T cells. Most clinical cellular immunotherapy protocols for CMV treatment have used CMV-specific cytotoxic CD8+ T-cell lines generated by repetitive in vitro stimulation with CMV antigens with success. Despite the proven efficacy, use of cellular therapy in the clinic has been limited, because the approach is time and labor consuming and requires specialized facility allowing handling of the therapeutic cells according to good manufacturing practice. In addition, no sustained response was seen after adoptive transfer that involved only cytotoxic CD8+ T cells. This phenomenon is supported by the fact that recall responses to latent infections depend on the presence of CD4+ T cells to help cytotoxic CD8+ T cells. An alternative approach for the transfer of T-cell immunity is the isolation of Ag-specific T cells ex vivo from the blood of CMV seropositive donors, based on interferon γ (IFN-γ) secretion of T cells after in vitro stimulation with viral Ag, resulting in a combination of CD4+ T helper and cytotoxic CD8+ CMV specific T cells. Using this strategy, a short-term ex vivo protocol was developed for the isolation of pp65 (CMV immunodominant protein)-specific T cells. Since then, several centers have used this protocol in the clinic, infusing low numbers of pp65-specific T cells, that were able to restore protective T-cell immunity against CMV in a post SCT setting in patients with refractory CMV disease or viremia. For this protocol the investigators have set up and validated this method of CMV-specific T-cell generation in the Ghent University Hospital and the investigators will make it available for other Belgian transplant centers.
Human cytomegalovirus (CMV) infection is a major cause of morbidity and mortality for recipients of allogeneic hematopoietic stem cell transplantation(HSCT). we propose to study the immunologic and virologic effects of donor derived CMV specific cytotoxic T lymphocyte (CMV-CTL) given to transplant recipients CMV antigen peptides will be used to induce the CMV antigen specific T lymphocytes derived from donor peripheral blood mononuclear cells for a period of 18~21 days.The patients will receive CMV-CTL cells when they are sero-positive for CMV-DNA 30 days after transplant. The CMV-DNA level will be monitored weekly after transfusion.
Cytomegalovirus (CMV) infections remain an important cause of morbidity and mortality in allogeneic hematopoietic cell transplant (HSCT) recipients, especially in patients received haploidentical transplantation. During the past decades, prophylactic or preemptive treatment with antiviral drugs has significantly reduce the incidence of early-onset CMV infection. Unfortunately, prolonged antiviral treatment is associated with substantial toxicity and may delay recovery of virus specific immune responses, resulting in an increasing of late-onset CMV disease. To date, adoptive immunotherapies have been developed as treatment alternatives to antiviral agents for CMV infection after HSCT. Studies have demonstrated that prophylactic or preemptive therapy with donor CMV-specific T cells can restore antiviral immunity and clear CMV viremia after transplantation. In this prospective clinical phase I/II trial, we propose to reconstitute antiviral immunity against CMV by preemptive transfer of CMV-specific T cells at an early time point after allogeneic stem cell transplantation. We also propose to demonstrate whether protect against CMV is associated with recovery of CMV-specific T cells.
This study is about treatment options for cytomegalovirus infections in people who have received stem cell transplants. The main aim of the study is to check if the cytomegalovirus infection can no longer be detected after treatment with marivabir or valganciclovir. Participants will take 2 tablets of marivabir or valganciclovir and 2 tablets of placebo twice a day for 8 weeks. A placebo will look like marivabir or valganciclovir but will not have any medicine in it. After treatment, each participant will be followed up for up to 12 weeks. Participants will visit their study clinic up to 18 times during the study.
The purpose of this study is to compare the safety and effectiveness of four different doses of cytomegalovirus vaccines in healthy adults.
The objectives of this first-in-human is to evaluate the safety and the immunogenicity of three administrations of a bivalent vaccine candidate against human cytomegalovirus, at three different dose levels.
The study will prospectively determine the clinical utility of CMV cell-mediated immunity using the Quantiferon test. The investigators will use the assay results to tailor the duration of CMV prophylaxis in solid organ transplant patients.
CMV lesions were found in the olfactory system of children with congenital CMV infection but no study has hitherto examined the impact of congenital CMV infection on olfaction. So the investigators propose in this study to assess the proportion of children with olfactory deficits among children with congenital CMV infection. Second this study will also evaluate performances of a new olfactory test, based on discrimination of binary odorant mixtures.
This study measured the changes in health-related complaints by analyzing charts of individuals, who are infected with a latent virus, who have used Gene-Eden-VIR/Novirin.
The primary objectives of this study were to evaluate the incidence of congenital CMV infection in neonates, and assess the concordance of detecting congenital cytomegalovirus (CMV) infection in neonatal saliva and urine samples.