View clinical trials related to Vaccine.
Filter by:Vi-DT Typhoid vaccine is a novel vaccine. This study will be done to know the long-term protection and persistent antibody by measured the antibody titer after 2,3,4 and 5 years after immunization.
The coronavirus disease 2019 (COVID-19) caused by the infection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)，resulting in more than 82 million confirmed cases and caused around 1.8 million deaths, as of 2 January 2021. The ongoing pandemic still poses unprecedented global threat to public health system worldwide. On December 31, 2020, the joint prevention and control agency of China Council announced that Sinopharm SARS-CoV-2 inactivated vaccine had been conditionally approved by National Medical Products Administration, and the protection rate was 79.34%. So far, more than 198 vaccines were currently in preclinical or clinical development. The investigators aimed to initiate an observational cohort of healthy individuals injected with SARS-CoV-2 Vaccine, which will perform a longitudinal, comprehensive analysis of the SARS-CoV-2 vaccine Induced adaptive immune responses.
The purpose of this study is to test over time immunity to the COVID-19 vaccines. Adults who are receiving COVID-19 vaccines will be invited to participate.
Eligible,healthy infants who have finished the 3-dose-schedule of sIPV+DTaP combined vaccination clinical trial (NCT04054882) will be recruited and divided into 4 groups, and will receive vaccination at the age of 18-month-old as follows: Group 1: sIPV + DTaP + MMR, Group 2: sIPV only, Group 3: DTaP only, Group 4: MMR only. The immunogenicity and safety of the 4 groups will be compared and analyzed before and 30 days after vaccination.
Tick-borne Encephalitis (TBE) can be prevented by vaccine. Vaccine failure, defined as a case of TBE regardless of previous vaccination, has been described and seems to be more predominant with increasing age, suggesting a less effective immune response following with increasing age. In fact previous studies has shown a reduced antibody response in elderly individuals compared to younger when vaccinated against TBE. As a result, in Sweden, an extra vaccine dose has been recommended during the primary vaccine schedule to individuals > 50 years of age. This alternative vaccine schedule has not been tested. The investigator aim to test if an extra vaccine dose in the primary vaccine schedule for those > 50 years of age improves the immune response and offers a corresponding immunity to younger individuals following TBE vaccination.
The purpose of this study is to determine if adding dietary fiber, such as inulin, to a diet that does not have enough fiber would raise the levels of potentially beneficial bacteria, such as Bifidobacterium, in the gut. There is evidence to suggest that these microbes can affect gut health and immune response, including to vaccines. The investigators will examine how inulin in the diet (compared to the maltodextrin control) (1) causes changes in the composition and function of the gut microbes, (2) reduces gut inflammation and gut leakiness caused by the vaccine, (3) increases immune response to vaccination, and (4) changes the expression of important adhesion molecules on the surface of white blood cells. Intestinal and whole-body responses will be measured in all participants.
The French Public Health Council recommended pneumococcal vaccination combined strategy for all immunocompromised patients in 2012. This strategy consisted in conjugated 13-valent pneumococcal injection followed 2 months later by polysaccharide 23-valent vaccine injection. General practitioners are usually in charge of this vaccination. Conjugated pneumococcal vaccine enhances the immunogenicity of the polysaccharide vaccine. Acute leukemia and lymphoma are treated with multiple courses of chemotherapy, impairing the immune system and potentially the response to vaccination. These patients are more at risk for developing pneumococcal invasive diseases than the general population. However, efficacy of pneumococcal vaccination is poorly documented in this setting. We assume that 70% of the patients are non-responders to vaccination, according to their anti-pneumococcal immunoglobulin G titers and the opsonophagocytic activity. To assess the immunogenicity of the pneumococcal vaccination combined strategy in adult population of acute leukemia and lymphoma, the investigator will measure anti-pneumococcal serotype-specific immunoglobulin G titers and opsonophagocytic activity at different time-points after completion of the combined vaccine strategy. The primary objective is to assess the immunogenicity of pneumococcal vaccination combined strategy at 3 months after the 13-valent pneumococcal injection (corresponding to 1 month after the end of the combined strategy) using immunoglobulin G titers and opsonophagocytic activity. At different time points (day 0, 1 month after the 13-valent pneumococcal injection, the day of the injection of the polysaccharide 23-valent vaccine, one month after the injection of the polysaccharide 23-valent vaccine, 3-6 months after the polysaccharide 23-valent vaccine,9-12 months after the polysaccharide 23-valent vaccine), the immunological response to vaccination will be monitored using specific-serotype immunoglobulin G titers, opsonophagocytic activity, and total anti-pneumococcal Immunoglobulin. The investigator will determine predictive factors of non-response to vaccination by comparing demographic data, biological data and treatment received by both acute myeloblastic leukemia and lymphoma patients. The tolerance and safety of the vaccination strategy will also be assessed in this specific hematological population.
This study evaluates the effect of an oral typhoid vaccine on disruption of the intestinal barrier and response of the immune system. Intestinal and whole-body responses will be measured in all participants before and after the vaccine.
This project involves a social media campaign to increase parent's knowledge and acceptance of the HPV (human papillomavirus) vaccine. The current vaccine protects against nine types of HPV, including seven that are known to cause cancer. The Centers for Disease Control and Prevention (CDC) estimates that the current HPV vaccine could prevent 90% of cancer cases caused by HPV, including cases of cervical cancer, oropharyngeal (mouth and throat) cancer, anal cancer, and others. About 150 and 104 cases of HPV-associated cancers are diagnosed each year in New Hampshire and Vermont, respectively-many of which could be prevented through vaccination. Currently, only 49.8% of New Hampshire adolescents and 44.3% of Vermont adolescents were not up-to-date for HPV vaccination as of 2016. This social media campaign is testing a set of campaign messages with parents locally and nationally to see which messages are most effective in improving their knowledge and acceptance of the vaccine. A study survey link will monitor the number of people reached and will measure parental intention to get their children vaccinated against HPV.
Invasive meningococcal disease and meningococcal meningitis caused by Neisseria meningitidis have their highest incidence in children, with a second peak in adolescents and young adults. The most important disease-causing serogroups are meningococcal serogroups A (MenA) and MenC in Asia, such as China. The specific vaccine use in each country depends on the predominant serogroups, cost, and availability. conjugate vaccines are preferred to polysaccharide vaccines due to their impact on decreasing nasopharyngeal carriage of N. meningitidis and their overall increased immunogenicity in children. This clinical trial is planning to evaluate the immunogenicity and safety of bivalent meningococcal serogroups A and C tetanus toxoid conjugate vaccine in Chinese healthy children aged 3 months to 5 years.