In 1918, nearly 40 million people died in a flu pandemic. Three such pandemics have occurred during the last 100 years.
When a new strain of flu infects people, the infection can spread around the world quickly. This is what could potentially happen with some new human flu viruses that come from bird flu viruses.
"Recently, some strains of bird flu viruses have infected people in Asia," said Robert Belshe, M.D., director of the Center for Vaccine Development at Saint Louis University School of Medicine. "There is concern these new strains could cause a pandemic, but they are not infecting people in the United States at this time. Rather than wait for that possibility to occur, the National Institutes of Health (NIH) is testing avian influenza vaccines."
The National Institute of Allergy and Infectious Diseases (NIAID), part of the NIH, has tested a new H5N1 avian influenza vaccine in healthy adults at clinical sites across the country. Now that safety data are available from the first adult study, NIAID plans to test this vaccine in other populations. As part of this plan, Saint Louis University will be testing an investigational vaccine in children ages 2 to 9, a population that is especially vulnerable to acquiring influenza.
Saint Louis University will conduct a research study using a killed flu virus vaccine for the bird flu virus, known as A/H5N1. This experimental vaccine was made the same way as "regular" flu vaccine that is given to people every year before flu season. In this study, researchers are evaluating the investigational vaccine's safety and ability to stimulate antibodies, part of the body's proteins that fight infections, in children. Study participants may receive two or three doses of the investigational vaccine. There is also a chance that participants will receive a placebo injection of saltwater instead of the investigational flu vaccine.
One hundred twenty children will be vaccinated nationwide. Researchers in St. Louis are looking for healthy children ages 2 to 9 to participate in this study. Children who were previously vaccinated against the flu this flu season are eligible for the study.