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Fine-tuning the flu vaccine for broader protection
Date:8/8/2011

An antibody that mimics features of the influenza virus's entry point into human cells could help researchers understand how to fine-tune the flu vaccine to protect against a broad range of virus strains. Such protection could potentially reduce the need to develop, produce, and distribute a new vaccine for each flu season.

A multi-institutional team led by Stephen C. Harrison, PhD, chief of the Division of Molecular Medicine at Children's Hospital Boston, report their work and its implications for improving influenza vaccination this week in the Early Edition of the Proceedings of the National Academy of Sciences.

With each passing season, the two primary components of the influenza virus's outer coat, neuraminidase and hemagglutinin (the annual flu vaccine's primary target), mutate, allowing the virus to dodge any anti-flu immunity an individual may have generated in previous years. This evasion strategy, called antigenic drift, is why a new flu vaccine is necessary every year, a process that can take upwards of seven months.

From a public health perspective, an ideal influenza vaccine would protect against multiple strains of the virus, regardless of their hemagglutinin structure. The antibody, discovered by Harrison's collaborators at Duke University Medical Center and called CH65, gives new insights into how the immune system's response to hemagglutinin evolves over time, knowledge that could guide the development of just such a vaccine.

The researchers started with cells donated by an individual who received the flu vaccine for 2007. From those cells, they used genomic tools to generate a suite of antibodies, including CH65, that bound to and neutralized hemagglutinin from several seasonal flu strains. CH65 alone could bind to and neutralize hemagglutinin from 30 of the 36 strains tested.

"While it's unusual to find such broadly effective antibodies to the flu virus, they may actually be more common th
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Contact: Children's Hospital Boston
Colleen.Connolly@childrens.harvard.edu
617-919-3110
Children's Hospital Boston
Source:Eurekalert

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