by stickdog99 » Wed Sep 27, 2006 11:30 pm
<!--EZCODE AUTOLINK START--><a href="http://www.sciencedaily.com/releases/2006/09/060925143523.htm">www.sciencedaily.com/rele...143523.htm</a><!--EZCODE AUTOLINK END--><br><br>Bird Flu Vaccine Additive May Stretch Supply<br><br>Researchers have achieved an effective immune response to an avian influenza vaccine with doses as low as one-quarter of the norm when they added a chemical mixture known as MF59. The research is published in the November 1 issue of Clinical Infectious Diseases, now available online.<br><br>MF 59 is an adjuvant--a substance that increases the immune system's ability to respond to a stimulus. For this research, the investigators used inactivated H9N2 influenza vaccines--not the H5N1 virus currently feared as a potential pandemic strain. However, the study does suggest that if the feared pandemic comes to be, adjuvants might be used to extend the vaccine supply. Furthermore, the authors note, H9N2 is itself a pandemic threat. <br><br><!--EZCODE AUTOLINK START--><a href="http://www.scharp.org/public/redbook/protocol/apxa2.htm">www.scharp.org/public/red.../apxa2.htm</a><!--EZCODE AUTOLINK END--><br><br>The adjuvant emulsion, MTP-PE/MF59, contains a muramyl tripeptide (MTP) linked covalently with dipalmitoyl phosphatidylethanolamine (PE) and MF59, a microfluidized oil-in-water emulsion. This emulsion, the adjuvant for the HIV-1 SF-2 rgp120, consists of 0.5% polysorbate 80 (Tween 80, polyoxyethylene sorbitan mono-oleate) and 0.5% sorbitan trioleate (Span 85, Arlacel 85) in a citrate buffer. Squalene (5%), a metabolizable lipid, constitutes the oil phase. For most studies, the preparation contains MF59 without MTP-PE.<br><br><!--EZCODE AUTOLINK START--><a href="http://www.who.int/vaccine_safety/topics/adjuvants/squalene/Jun_2006/en/index.html">www.who.int/vaccine_safet...index.html</a><!--EZCODE AUTOLINK END--><br><br>Squalene alone is not an adjuvant, but emulsions of squalene with surfactants enhance the immune response when added to antigens. MF59, a proprietary adjuvant containing squalene, is included in a seasonal subunit influenza vaccine licensed by the Italian regulatory authority in 1997 and subsequently by several other countries. The vaccine contains about 10 mg of squalene per dose. Over 22 million doses have been distributed since that time. Reported rates of adverse events and local reactogenicity are not in excess of those that would be expected with other inactivated seasonal flu vaccines, suggesting that squalene in this vaccine poses no significant risk. This vaccine has been administered primarily to individuals aged 65 years and older, for whom the vaccine was licensed.<br><br><!--EZCODE AUTOLINK START--><a href="http://www.gulfwarvets.com/additive.htm">www.gulfwarvets.com/additive.htm</a><!--EZCODE AUTOLINK END--><br><br>Trace amounts of the additive squalene have been found in the anthrax vaccine used to protect U.S. service members from the biological warfare agent, federal health officials have found.<br><br>The finding contradicts repeated assertions by the Pentagon that squalene is not present in the vaccine.<br><br>The federal Food and Drug Administration said its results were based on tests of five lots of the vaccine. The agency did not make clear whether those lots containing squalene were used to inoculate troops during the Persian Gulf War, those receiving the vaccine since a mandatory inoculation program began in 1998, or both.<br><br>The FDA also did not address potential health problems with the vaccine; agency spokeswoman Lenore Gelb declined to comment.<br><br>Squalene is found in the human liver, some vegetable oils and shark oil; as an additive to a vaccine, it is used to foster a faster, stronger or longer protective reaction, according to a 1999 U.S. Government Accounting Office report. It is not approved by the FDA for use in the anthrax vaccine.<br><br>Squalene's safety was called into question when a 1999 Tulane University study of blood samples taken from sick gulf war veterans detected the presence of antibodies linked to the additive. Some of the samples were taken from soldiers who did not take part in the war; but all presumably received the vaccine.<br><br>Previously, Congress' watchdog agency, the General Accounting Office, had reported that gulf war veterans were complaining of mysterious, undiagnosed illnesses similar to patients with auto-immune disorders. A Tennessee immunologist, Dr. Pamela B. Asa, concluded those illnesses were caused by exposure to additives in vaccines, the GAO said.<br><br>James Turner, a Pentagon spokesman, said Wednesday that officials in his department were not prepared to comment on the FDA's finding.<br><br><!--EZCODE AUTOLINK START--><a href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12042063&dopt=Abstract">www.ncbi.nlm.nih.gov/entr...t=Abstract</a><!--EZCODE AUTOLINK END--><br><br>Sorbitan Laurate and Sorbitan Trioleate were cocarcinogens in one mouse study ... <p></p><i></i>