View clinical trials related to Influenza, Human.
Filter by:Studies have shown that a broader spectrum influenza vaccine may help in reducing the influenza burden of disease. Butantan Institute is currently developing a quadrivalent influenza vaccine candidate. This study is will provide safety and immunogenicity data on this quadrivalent influenza vaccine candidate. The study will be conducted in an open population of healthy participants (3 years old and above) recruited in different clinical sites in Brazil and will be adequately powered to assess safety, immune response (measured by GMT HI antibodies) to each viral strain in the vaccines and lot-to-lot consistency.
This is a single-site, randomized, double-blind, placebo-controlled study of Uniflu in fifty four (54) volunteers 18-60 years of age with a dose escalation. All subjects will receive an intramuscular (IM) injection twice,with a 21 days interval between treatments.
Each winter, viruses belonging to two kinds of influenza A ("A/H1N1" & "A/H3N2") and two kinds of influenza B ("B/Yamagata" & "B/Victoria") can cause illness. Historically, the yearly influenza vaccine that was recommended in children was designed to protect against both kinds of influenza A but only one kind of influenza B. In a series of trials conducted between 2008-09 and 2010-11 (TITRE I, II, and IIB), the TITRE investigators measured antibody response to influenza B in children who were primed with two doses of trivalent inactivated influenza vaccine (TIV) containing B/Yamagata. Overall, the investigators found that 2 doses of vaccine containing B/Yamagata did not adequately prime children for response to the alternate B/Victoria antigen and that subsequent vaccine doses containing B/Victoria-lineage antigen strongly boosted antibodies to the B/Yamagata antigen that was introduced during first immunization priming, but with lower responses to B/Victoria. For the first time since 2009-10, the recommended B/Victoria component of the seasonal influenza vaccine has been changed, from B/Brisbane/60/2008 to B/Colorado/60/2007 for the coming 2018-19 season. The investigators thus have a unique opportunity to clarify lineage-specific influenza B responses in a well-characterized cohort of children originally primed to Yamagata. The investigators' main interest is to assess whether TITRE I children primed with two doses of B/Yamagata in 2008-09 have since or are now capable of achieving a sufficient antibody response to B/Victoria following a single dose of 2018-19 QIV, ten years after their initial TIV B/Yamagata priming exposure.
Immunization with the inactivated influenza vaccine with blood samples collected at 7 visits (baseline, day 7, 14, 28, 60, 90 and 180, fine needle aspiration (FNAs) from axillary lymph nodes at baseline, days, 4, 14, 28, 60 and 180. BMA at baseline, days 28 and 180.
A total of 18,000 eligible subjects (or 6,000 subject distributed evenly between the 3 study arms) will be enrolled. Eligible subjects will be randomized in 1:1:1 (cell-culture-based vaccine, the recombinant vaccine, or the egg-based vaccine) over four influenza seasons (2018-2019, 2019-2020, 2020-2021, and 2021-2022).
• This study will assess the effect of promotional messaging and incentives encouraging influenza vaccination in the Sendero IdealCare policy holders during the 2018-2019 Flu Season. The intervention will consist of influenza vaccination promotion/reminders from Sendero Health Plans to subscribers, including text messages, emails, and tailored direct mail outs, i.e. postcard or a personalized letter, and incentive. The study population consists of approximately 22,500 subscribers enrolled in Sendero IdealCare Plan. The intervention will last approximately four months. The primary endpoints, assessed through administrative claims data, will be getting a flu shot during the 2018-2019 season. Data collected through this study will be used to determine effective components of influenza vaccination promotion campaigns used by a health insurance plan.
Licensed influenza vaccines are manufactured with a variety of technologies. The majority are split, inactivated vaccines derived from egg-adapted, high growth reassortant viruses. Two US licensed products do not use egg-adapted viruses: Flucelvax (mammalian cell culture) and FluBlok (recombinant). There is increasing evidence that egg propagation induces virus mutations that impair the immune responses to circulating viruses. However, the impact of egg-propagation on clinical vaccine effectiveness is uncertain, and there is no preferential recommendation for any specific influenza vaccine product or technology. A direct comparison of serologic response to egg based and non-egg based vaccines in adults has not been performed. This randomized trial will compare serologic responses to the egg- and non-egg A(H3N2) vaccine component. The study cohort will be followed for two influenza seasons to evaluate sequential vaccination effects on immune response.
The aim of this study is to investigate the immunogenicity and safety of the inactivated whole-virion vaccine for teenagers and adults. The investigators will test the vaccine in participants aged 12-60 years, for a randomized, blind, placebo-controlled, age-stratified clinical study. The investigators designed three dosage groups: 7.5 μg,15 μg and 30 μg of hemagglutinin antigen. According to the age of the subjects, Each group was divided into different age subgroups. Phosphate buffer solution and Aluminum hydroxide adjuvant as placebo controls were both set up in the subgroups.Participants will receive 2 doses of vaccine at 21-day intervals.Safety up to 6 months and changes in hemagglutinin inhibition (HI) titers at 21 days after each vaccination were determined.
This study investigate the prevalence of elevated biomarkers of cardiac injury in patients with suspected influenza infection and the prognostic implication on the composite endpoint of death of any cause, hospitalization due to myocardial infarction, unstable angina, heart failure and stroke.
This study allows to evaluate the strength and duration of immune responses between annual receipt of standard inactivated vaccine and alternative potent vaccines, including annual receipt of adjuvanted inactivated vaccine, annual receipt of high-dose inactivated vaccine, annual receipt of recombinant HA vaccine, and the alternate combinations of the former three vaccines over four years, for identifying improved vaccination strategies for influenza vaccination in older adults in a location experiencing a subtropical pattern in influenza activity.