Scientist warns over pandemic flu vaccine 6-month time lagApril 28, 2009Study is first to show pre-pandemic vaccine approach 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. By that time, the first wave of pandemic flu may be over before people are vaccinated, says Dr Iain Stephenson, Consultant in Infectious Diseases at the Leicester Royal Infirmary and a Clinical Senior Lecturer at the University of Leicester. In his paper published in PNAS- Proceedings of the National Academy of Sciences of the USA- Dr Stephenson makes the first case for a pre-pandemic vaccine to mitigate the worst effects of pandemic flu. He said: "This study is the first to show an effective pre-pandemic vaccine approach. This means that we could vaccinate people potentially many years before a pandemic, to generate memory cells that are long lasting and can be rapidly boosted by a single dose of vaccine when needed." Dr Stephenson, of the Department of Infection, Immunity and Inflammation at the University of Leicester, said: "If an influenza pandemic occurs, vaccination will to be the main way to protect the population. The major current threat seems to be from avian influenza H5N1 (bird flu) which has spread rapidly around the world and causes human infections and deaths. "Unfortunately, if a pandemic occurs, it will take up to six months to manufacture effective vaccine, so the first waves of the pandemic may be over before people are vaccinated. Furthermore, most people need two doses of H5 pandemic vaccine to get protection- so this adds a further delay. "To reduce any delay, we could consider stockpiling vaccine or immunizing people with vaccine prepared in advance -(a so called 'pre-pandemic vaccine' - to protect them before a future pandemic. "However, we don't know which strain of influenza will cause the pandemic. There are several strains of H5N1 virus, so we can't be sure of which virus strain to make pre-pandemic vaccine from. Therefore a 'pre-pandemic' vaccine needs to give cross protection to as many H5 strains as possible." Dr Stephenson and his team conducted a study comparing the effect of a single H5 bird flu vaccine dose to people who had been vaccinated with an H5 vaccine previously with people who had not previously received vaccine. The aim was the test out the idea of a pre-pandemic vaccination approach. He said: "We found that those people who received H5 vaccine between 1999 and 2001 responded very well to a single dose of a newer H5 vaccine. They had memory cells that gave a rapid protective response within 7 days of the repeat vaccine. Also the response was very broad and able to protect against all known strains of H5N1 virus. "In contrast, those people who had not been previously vaccinated with H5 vaccine, behaved as we had expected. They required 2 doses of vaccine and got good antibody responses up to 6 weeks after the first dose." Dr Stephenson added that this was the first study to show an effective pre-pandemic vaccine approach. The trial subjects were all recruited at the University of Leicester or University Hospitals of Leicester. University of Leicester |
|||||||||||||||||||||
| Related Pandemic Current Events and Pandemic News Articles New Synthetic Molecules Trigger Immune Response to HIV and Prostate Cancer Researchers at Yale University have developed synthetic molecules capable of enhancing the body's immune response to HIV and HIV-infected cells, as well as to prostate cancer cells. Their findings, published online in the Journal of the American Chemical Society, could lead to novel therapeutic approaches for these diseases. When should flu trigger a school shutdown? As flu season approaches, parents around the country are starting to face school closures. But how bad should an influenza outbreak be for a school to shut down? Sneezing in times of a flu pandemic The swine flu (H1N1) pandemic has received extensive media coverage this year. The World Health Organization, in addition to providing frequent updates about cases of infection and death tolls, recommends hyper vigilance in daily hygiene such as frequent hand washing or sneezing into the crook of our arms. Initial Results Show Pregnant Women Mount Strong Immune Response To One Dose of 2009 H1N1 Flu Vaccine Healthy pregnant women mount a robust immune response following just one dose of 2009 H1N1 influenza vaccine, according to initial results from an ongoing clinical trial sponsored by the National Institute of Allergy and Infectious Diseases (NIAID) of the National Institutes of Health. Global challenges and opportunities in fighting HIV/AIDS and neglected diseases Responding to the HIV/AIDS pandemic and tackling so-called neglected tropical diseases are the focus of the November/December 2009 edition of Health Affairs. Pandemic flu vaccine campaigns may be undermined by coincidental medical events The effectiveness of pandemic flu vaccination campaigns - like that now underway for H1N1 - could be undermined by the public incorrectly associating coincidental and unrelated health events with the vaccines. Lessons from flu seasons past Pregnant women who catch the flu are at serious risk for flu-related complications, including death, and that risk far outweighs the risk of possible side effects from injectable vaccines containing killed virus, according to an extensive review of published research and data from previous flu seasons. Swine flu vaccine must be free and safe for high uptake Almost half of adults surveyed in Summer 2009 in Hong Kong (45%) say they would take up free swine flu vaccination. Older Patients with Dementia at Increased Risk for Flu Mortality An epidemiological study on pneumonia and influenza (P&I) in adults age 65 and over reports that patients with dementia are diagnosed with flu less frequently, have shorter hospital stays, and have a fifty percent higher rate of death than those without dementia. Triple-Combo Drug Shows Promise Against Antiviral-Resistant Swine Flu, UAB Researcher Says An experimental drug cocktail that includes three prescriptions now widely available offers the best hope in developing a single agent to treat drug-resistant H1N1 swine flu, says a virology researcher in the University of Alabama Birmingham (UAB) Division of Pediatric Infectious Diseases. More Pandemic Current Events and Pandemic News Articles |
|||||||||||||||||||||
|
|||||||||||||||||||||
|
|||||||||||||||||||||