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Duke To Test Bird Flu Vaccine Dosing
March 31, 2006DURHAM, N.C. - A clinical trial to test different strengths of a vaccine designed to fight avian influenza will begin this month at Duke University Medical Center.
The Duke study is part of a multicenter trial that will test a modified form of an investigational bird flu vaccine to determine whether the vaccine still triggers a strong immune response at lower doses.
The seven-month trial is sponsored by the National Institute of Allergy and Infectious Diseases of the National Institutes of Health. Also participating in the study are the University of Maryland, the University of Rochester and Baylor College of Medicine.
"We hope that by adding a compound called an adjuvant to the vaccine, we can create a stronger immune response to smaller doses of the vaccine," said Emmanuel Walter, M.D., associate director of the Duke Clinical Research Institute's Primary Care Research Consortium and leader of the Duke study. "If the smaller dose stimulates immunity against the virus, then more people could be immunized with existing supplies if a pandemic occurs," he said.
The study will use an inactivated flu virus vaccine based on a strain taken from a Vietnamese patient in 2004. "There is no live flu virus in the vaccine, and there is no risk of volunteers contracting bird flu or spreading it to others," Walter said.
The vaccine is designed to protect against the H5N1 strain of bird flu that has infected poultry in Asia, Europe and Africa and killed 101 humans. Initial trials in healthy adults showed the vaccine was safe and produced an immune response but required high doses and at least two injections to initiate a strong response, Walter said.
Trial participants will receive varying strengths of the H5N1 vaccine, either with or without an aluminum hydroxide adjuvant. An adjuvant works by increasing the body's immune response to a vaccine, Walter said. Aluminum hydroxide is commonly used in pediatric and adult vaccines, including those for whooping cough, hepatitis A and hepatitis B.
As with current flu vaccines given yearly in the U.S., the H5N1 vaccine causes the body's immune system to make antibodies to fight infection. In previous studies with this vaccine, two doses were necessary to stimulate antibodies. The doses needed to trigger antibodies were also much higher than necessary for other types of flu, Walter said.
The Duke researchers will recruit approximately 150 volunteers between the ages of 18 and 49 years. The volunteers will have a medical screening, have their blood drawn several times and receive two injections. Volunteers will be randomly assigned to two different groups - one receiving the vaccine with adjuvant and one receiving the vaccine alone. Several different doses will be tested to help determine the right dose to stimulate antibodies. Participants will keep a journal to record any side effects and will receive checkups to monitor their health. Compensation will be provided.
Duke will begin screening potential study volunteers this month. People interested in participating in the study should call (919) 620-5354.
Duke University Medical Center
"We hope that by adding a compound called an adjuvant to the vaccine, we can create a stronger immune response to smaller doses of the vaccine," said Emmanuel Walter, M.D., associate director of the Duke Clinical Research Institute's Primary Care Research Consortium and leader of the Duke study. "If the smaller dose stimulates immunity against the virus, then more people could be immunized with existing supplies if a pandemic occurs," he said.
The study will use an inactivated flu virus vaccine based on a strain taken from a Vietnamese patient in 2004. "There is no live flu virus in the vaccine, and there is no risk of volunteers contracting bird flu or spreading it to others," Walter said.
The vaccine is designed to protect against the H5N1 strain of bird flu that has infected poultry in Asia, Europe and Africa and killed 101 humans. Initial trials in healthy adults showed the vaccine was safe and produced an immune response but required high doses and at least two injections to initiate a strong response, Walter said.
Trial participants will receive varying strengths of the H5N1 vaccine, either with or without an aluminum hydroxide adjuvant. An adjuvant works by increasing the body's immune response to a vaccine, Walter said. Aluminum hydroxide is commonly used in pediatric and adult vaccines, including those for whooping cough, hepatitis A and hepatitis B.
As with current flu vaccines given yearly in the U.S., the H5N1 vaccine causes the body's immune system to make antibodies to fight infection. In previous studies with this vaccine, two doses were necessary to stimulate antibodies. The doses needed to trigger antibodies were also much higher than necessary for other types of flu, Walter said.
The Duke researchers will recruit approximately 150 volunteers between the ages of 18 and 49 years. The volunteers will have a medical screening, have their blood drawn several times and receive two injections. Volunteers will be randomly assigned to two different groups - one receiving the vaccine with adjuvant and one receiving the vaccine alone. Several different doses will be tested to help determine the right dose to stimulate antibodies. Participants will keep a journal to record any side effects and will receive checkups to monitor their health. Compensation will be provided.
Duke will begin screening potential study volunteers this month. People interested in participating in the study should call (919) 620-5354.
Duke University Medical Center
Scientist warns over pandemic flu vaccine 6-month time lag
New research published today (Monday April 27) from the University of Leicester and University Hospitals of Leicester NHS Trust warns of a six-month time lag before effective vaccines can be manufactured in the event of a pandemic flu outbreak.
New vaccine may give long-term defense against deadly bird flu and its variant forms
A new vaccine under development may provide protection against highly pathogenic bird flu and its evolving forms, according to researchers at Purdue University and the Centers for Disease Control and Prevention who discovered the new preventative drug and have tested it in mice.
Bird-flu vaccine works at high doses; Focus turns to ways to stretch vaccine supply
An experimental vaccine against bird flu is safe and spurs the immune response considered necessary to protect against the deadly illness, at a dose several times larger than the traditional flu shot and in slightly more than half of people who received the largest dose.
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