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Sanofi Pasteur's Fluzone High-Dose Vaccine Significantly More Effective Than Standard Dose Fluzone Vaccine In Preventing Influenza In Adults 65 Years Of Age And Older

"Influenza vaccines have been shown to offer public health benefits in preventing influenza and its complications in all age groups; however, older adults still have the highest rates of influenza-related hospitalization and death despite having high immunization rates, " said John Shiver, Senior Vice President, Research and Development, Sanofi Pasteur. "This led Sanofi Pasteur to develop Fluzone High-Dose vaccine, which this trial has confirmed provides better protection against influenza compared to Fluzone vaccine in people 65 years of age and older."

Fluzone High-Dose vaccine was licensed in the United States by the Food and Drug Administration (FDA) in December 2009 based on the vaccine's safety profile and superior immunogenicity compared to Fluzone vaccine. Immunogenicity (the ability of a vaccine to trigger the body to produce antibodies against an infectious agent) is commonly used to evaluate vaccines in clinical trials. Fluzone High-Dose vaccine contains 60 mcg of hemagglutinin antigen per strain of influenza virus in the vaccine as compared to 15 mcg of influenza virus hemagglutinin antigen per strain of influenza virus in standard dose Fluzone vaccine. Fluzone High-Dose vaccine was licensed by the FDA under an accelerated approval process to address the medical need in older adults. As a requirement of the accelerated approval pathway, Sanofi Pasteur embarked on this large-scale, two-season, confirmatory efficacy trial, involving more than 30,000 participants 65 years of age and older, to evaluate the clinical benefit of Fluzone High-Dose vaccine compared to Fluzone vaccine in the prevention of influenza disease.  

About Influenza Disease in People 65+ Years of Age

Research has shown that the immune system weakens as people age. Older adults are not only more susceptible to infections, but also less responsive to vaccination. When infected with the influenza virus, they are less able to mount an effective immune response to neutralize the attack. Compared to younger adults, people 65 years of age and older suffer disproportionately from seasonal influenza disease and its complications, including severe illness leading to hospitalization and death. Although this group comprises only 15 percent of the U.S. population, on average it accounts for 65 percent of the estimated 226,000 hospitalizations and 90 percent of the 3,000 to 49,000 deaths attributed to seasonal influenza and its complications each year. The first baby boomers began to turn 65 in 2011 and, by the year 2030, the number of adults 65 years of age and older is anticipated to double and surpass 70 million people, comprising 20 percent of the U.S. population. Thus, better prevention of influenza in older adults can have a significant impact on public health, quality of life, and healthcare costs .

About Fluzone High-Dose Vaccine

Indication Fluzone High-Dose vaccine is an inactivated influenza virus vaccine given for active immunization in persons 65 years of age and older against influenza disease caused by influenza virus subtypes A and type B contained in the vaccine. Approval of Fluzone High-Dose vaccine is based on superior immune response relative to Fluzone vaccine. Data demonstrating a decrease in influenza disease after vaccination with Fluzone High-Dose vaccine relative to Fluzone vaccine have not yet been reviewed by FDA.

Safety Information

The most common side effects to Fluzone High-Dose vaccine include pain, swelling, and redness at the injection site; fever, headache, fatigue, and muscle aches. Other side effects may occur. Fluzone High-Dose vaccine should not be given to anyone with a severe allergic reaction to any vaccine component, including eggs or egg products, or to a previous dose of any influenza vaccine.

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