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Immunization; Infection clinical trials

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NCT ID: NCT06185647 Recruiting - Bronchiolitis Clinical Trials

Evaluation in Practice of the Impact of NIrsevimab on EmeRgency Use for BRONCHIOlitis

EPINIR-BRON
Start date: October 14, 2023
Phase:
Study type: Observational

In July 2023, the Food and Drug Administration approved nirsevimab (Beyfortus®), a long-acting monoclonal antibody, for passive immunization to prevent RSV-associated lower respiratory tract infection (Bronchiolitis) among infants and young children. In Europe, The European Medicines Agency approved the use of BEYFORTUS in October 2022. In France, The Haute Autorité de Santé (HAS) approved the use of BEYFORTUS in July 2023 starting in September 2023. Beyfortus is administered as a single intramuscular injection prior to or during RSV season. This single dose may provide protection during the whole RSV season. The safety and efficacy of Beyfortus® were supported by three clinical trials (1-3). The key measure of efficacy was the incidence of medically attended RSV lower respiratory tract infection (MA RSV LRTI ) evaluated during the 150 days after Beyfortus® administration. Beyfortus® reduced the risk of MA RSV LRTI by approximately 70% to 75% relative to placebo. The objective of this observational study is to assess in the real-world the effectiveness of nirsevimab on the Emergency Department use for bronchiolitis as well on the effectiveness of nirsevimab to reduce hospitalization and healthcare usage in France where a national campaign to administer nirsevimab to young infants stated on September 14th, 2023. Type of study Retrospective observational study of medical records which include systematic and prospective data on nirsevimab immunization status of patients visiting the Emergency Department. Methodology This retrospective observational study will include two data set analysis. On one part, data from all infants presenting to the emergency department and diagnosed as having bronchiolitis will be retrieved from medical and nursing records and those who had been given nirsevimab will be compared with those who did not receive this medication prior to the ED visit. On the other part, since the investigators have included nirsevimab administration in their systematic data collection on immunization of all infants visiting our ED, the investigators will use the nirsevimab immunization status of infants diagnosed as having bronchiolitis with those do not having bronchiolitis in order to assess the effectiveness (real-world effect) of nirsevimab on the ED use and hospitalization.

NCT ID: NCT05859490 Recruiting - Clinical trials for Immunization; Infection

Immunogenicity of Yellow Fever Vaccine 17D in Adults With Prior 17D Vaccination

Start date: August 1, 2023
Phase: Phase 1/Phase 2
Study type: Interventional

The goal of this clinical trial is to assess the immune response to the yellow fever vaccine 17D in adults with prior 17D vaccination. The main questions this study aims to answer are: - how does prior vaccination affect antibody responses to re-vaccination? - how does prior vaccination affect the immune cell response to re-vaccination? Participants will: - have been previously vaccinated with 17D. - be re-vaccinated with 17D. - provide medical and travel histories. - provide a blood sample prior to vaccination - provide a blood sample approximately every other day for 14 days after vaccination. - provide a blood sample approximately 28 days after vaccination. - complete a daily diary of symptoms following vaccination for 14 days. - report any additional symptoms after 14 days.

NCT ID: NCT05774093 Recruiting - COVID-19 Infection Clinical Trials

Evaluation of COVID-19 Immune Barrier and Reinfection Risk

COVID
Start date: March 6, 2023
Phase:
Study type: Observational

The goal of this observational study is to evaluate the protective effect of immune barrier on secondary infection after COVID-19 (coronavirus disease 2019) vaccination or COVID-19 virus Omicron B A. 5.2 strain infection by dynamically monitoring the COVID-19 antibody titer, cellular immune function and the occurrence of secondary infection of healthy participants, mainly medical staff in our hospital, to understand the cross protective effect of COVID-19 antibody on different variants of Omicron, and explore the best time to use COVID-19 vaccine to strengthen immunity after Omicron mutant infection.

NCT ID: NCT05215327 Recruiting - Influenza Clinical Trials

High vs. Standard Dose Influenza Vaccine in Lung Allograft Recipients

Start date: November 7, 2022
Phase: Phase 2
Study type: Interventional

Lung allograft recipients have a higher burden of influenza disease and greater associated morbidity and mortality compared with healthy controls. Induction and early maintenance immunosuppression is thought to impair immunogenicity to standard dose inactivated influenza vaccine. This early post-transplant period is when immunity is most desirable, since influenza disease during this time frame is associated with adverse consequences. Thus, strategies to reduce severe influenza disease in this highly susceptible population are critical. No trials in lung transplant recipients have evaluated two doses of HD-IIV within the same influenza season as a strategy to improve immunogenicity and durability of influenza prevention. Furthermore, no influenza vaccine trials have focused on enrollment of subjects at early post-transplant timepoints. Very few studies have been performed in solely lung allograft recipients. Immunosuppression intensity is highest in lung patients, thereby limiting comparisons to recipients of heart, liver, and kidney transplants. Therefore, studies to assess both HD-IIV and two-dose strategies in the same influenza season in post-lung transplant recipients are greatly needed. The central hypothesis of our proposal is that lung allograft recipients who are 1-35 months post-transplant and receiving two doses of HD-quadrivalent inactivated influenza vaccine (QIV) will have higher HAI geometric mean titers (GMT) to influenza antigens compared to those receiving two doses of SD-QIV. To test this hypothesis and address the above critical knowledge gaps, we propose to conduct a phase II, multi-center, randomized, double-blind, controlled immunogenicity and safety trial comparing the administration of two doses of HD-QIV to two doses of SD-QIV in lung allograft recipients 1-35 months post-transplant. The results of this clinical trial will address significant knowledge gaps regarding influenza vaccine strategies (e.g., one vs. two doses and HD-QIV vs. SD-QIV) and immune responses in lung transplant recipients and will guide vaccine recommendations during the post-transplant period.

NCT ID: NCT04816760 Recruiting - Clinical trials for Endothelial Dysfunction

Immune Cells Phenotypes During COVID-19

IMMUNO-COVID
Start date: March 25, 2020
Phase:
Study type: Observational

The ongoing pandemic caused by the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS CoV-2) has infected more than one hundred twenty million peoples worldwide one year after its onset with a case-fatality rate of almost 2%. The disease due to the coronavirus 2019 (i.e., COVID-19) is associated with a wide range of clinical symptoms. As the primary site of viral invasion is the upper respiratory airways, lung infection is the most common complication. Most infected patients are asymptomatic or experience mild or moderate form of the disease (80 %). A lower proportion (15%) develop severe pneumonia with variable level of hypoxia that may required hospitalization for oxygen therapy. In the most severe cases (5%), patients evolve towards critical illness with organ failure such as the acute respiratory distress syndrome (ARDS). At this stage, invasive mechanical ventilation is required in almost 70 % and the hospital mortality rises to 37 %. Immune cells are key players during SARS CoV-2 infection and several alterations have been reported including lymphocytes (T, B and NK) and monocytes depletion, and cells exhaustion. Such alterations were much more pronounced in patients with the most severe form of the disease. Beside, a dysregulated proinflammatory response has also been pointed out as a potential mechanism of lung damage. Finally, COVID-19 is associated with an unexpectedly high incidence of thrombosis which probably results from the viral invasion of endothelial cells. The investigators aim to explore prospectively the alterations of innate and adaptive immune cells during both the acute and the recovery phase of SARS CoV-2 pneumonia. Flow and Spectral cytometry will be used to perform deep subset profiling focusing on T, B, NK, NKT, gamma-gelta T, monocytes and dendritic cells. Each specific cell type will be further characterized using markers of activation/inhibition, maturation/differenciation and senescence as well as chemokines receptors. T-cell memory specificity will be explore using specific SARS CoV-2 pentamer. Platelet activation and circulating microparticles will be explore using flow cytometry. Serum SARS CoV-2 antibodies (IgA, IgM, IgG), serum cytokines, and serum biomarkers of alveolar epithelial and endothelial cells will be analyze using ELISA and correlate with the severity of the disease.

NCT ID: NCT04613206 Recruiting - Influenza Clinical Trials

High vs. Standard Dose Influenza Vaccine in Adult SOT Recipients

Start date: January 11, 2021
Phase: Phase 2
Study type: Interventional

The influenza virus is a significant cause of morbidity in adult solid organ transplant (SOT) recipients. However, these individuals show a suboptimal response to vaccines including the standard-dose (SD) inactivated influenza vaccine (IIV). Recent studies have investigated two strategies to overcome poor immune responses in SOT recipients: (1) administration of high-dose (HD)-IIV compared to SD-IIV and (2) two doses of SD-IIV compared to one dose of SD-IIV in the same influenza season. The first study compared HD-IIV vs. SD-IIV in adult SOT and noted HD-IIV was safe and reported higher immunogenicity; however, the median post-transplant period was 38 months. In another phase II trial of adult SOT recipients, two doses of SD-IIV a month apart compared to one-dose SD-IIV revealed increased immunogenicity, with a median post-transplantation period of 18 months. Therefore, these studies lack evaluation in the early post-transplantation period in this vulnerable population when influenza disease is most severe. The administration of two-doses of HD-IIV in the same influenza season has also not been studied in SOT recipients. Moreover, the vast majority of SOT influenza vaccinations studies have not substantively evaluated prolonged immunogenicity. Thus, the optimal immunization strategy for SOT recipients less than 12 months post-transplant is poorly-defined. In addition, the immunologic predictors and correlates of influenza vaccine immunogenicity in SOT recipients have not been defined. The investigators hypothesize that adult solid organ transplant recipients that are 1-11 months out from transplant and are receiving high-dose inactivated influenza vaccine will have higher hemagglutination inhibition (HAI) geometric mean titers to influenza A antigens compared to adult SOT recipients receiving standard-dose inactivated influenza vaccine. To test this hypothesis and address the above critical knowledge gaps, The investigators propose to conduct a phase II multicenter randomized controlled trial comparing either two doses HD-IIV, two doses of SD-IIV, or one-dose of HD-IIV in adult kidney, heart, and liver SOT recipients 1-11 months post-transplantation. The results of this study will address significant gaps in knowledge regarding influenza vaccine strategies and immune responses in adult SOT recipients and will guide vaccine recommendations in this vulnerable population.

NCT ID: NCT04347694 Recruiting - SARS-CoV 2 Clinical Trials

Study to Determine the Immunization Status Among Nephrological Health Care Personnel Against SARS-CoV-2 in a Single Center Over the Course of 12 Months During the Worldwide COVID-19 Pandemic.

CONEC
Start date: April 11, 2020
Phase:
Study type: Observational

Infections with Corona-Viruses have shown to be a menace for patients with comorbidities such as hypertension, diabetes, cardiovascular disease or immunosuppression. Those are features almost every nephrological patient brings along, especially those on maintenance dialysis and those with renal transplant. Since the emergence of the novel coronavirus SARS-CoV-2 in November 2019 in Mainland China the fear for pandemic infections has increased. But not only is the course of infection itself important, the prevention of transmission to and by attending medical personnel should be put into perspective. Thus there is a lack of sufficient data of occult immunization or persistent state on immunization. In our study up to 400 health care personnel will be screened serologically for IgM, IgA and IgG against the SARS-CoV-2 virus. Blood and urine samples throughout 12 months will be sampled and analyzed. The aim of the study is to identify the rate of occult immunization and at the same time to gather data about the persistence of immune response to an infection with SARS-CoV-02. The results will help provide sufficient safety measures for health care providers and renal patients undergoing unavoidable clinical treatment.

NCT ID: NCT03854630 Recruiting - HIV Infections Clinical Trials

Hepatitis B Virus Vaccination in HIV-positive Patients and Individuals at High Risk for HIV Infection

Start date: September 6, 2017
Phase: Phase 4
Study type: Interventional

The primary aim of this open-label, randomized control trial is to compare the immunogenicity at week 28 after 20µg HBV vaccine (at week 0, 4, 24) versus 40µg HBV vaccine (40-µg at week 0, 4, 24 week) among HIV-positive patients or HIV-negative MSM who were born in Taiwan after July 1986 and tested negative for all HBV serological markers. The secondary aims are to assess the safety of double-dose HBV vaccination, the proportions of high-level responders (anti-HBs antibody >100 mIU/ml) at weeks 28 and 48, the serological responses at week 48, and incident HBV infection (indicated by appearance of anti-HBc and/or HBsAg) at week 48.

NCT ID: NCT03107312 Recruiting - Clinical trials for Immunization; Infection

Bioarray for the Serological Assessment of Immunity Against Vaccine-preventable Infections

StikoSero
Start date: April 1, 2017
Phase: N/A
Study type: Observational

Recent observations in Germany revealed above-average high proportions of refugees affected by infectious diseases of public health significance. Scrutiny of the vaccination status showed sizeable presence of seronegative subjects, with conspicuously higher prevalence among children and adolescents, thus indicating urgent necessity of i) rapid identification of carriers of vaccine-preventable diseases and ii) adjustment of protection against such infections to European Standards. Rapid immune status check needs comprehensive diagnostic tool permitting simultaneous assessment of seropositivity. Validation of such tools requires comparisons of the immune status of subjects with known vaccination history with that of migrants with incomplete or missing health and vaccination records.