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Moving Towards a Universal Flu Vaccine

Published: Monday, December 31, 2012
Last Updated: Monday, December 31, 2012
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Israeli company reports good results with supplemental shot in elderly.

Multimeric-001, an influenza vaccine now in clinical trials, boosts immunity in elderly people when given as a supplement to the seasonal shot.

But supplementation is just a short-term goal: eventually the drug’s maker, BiondVax Pharmaceuticals of Ness Ziona, Israel, believes that Multimeric-001 alone could protect against all strains of flu.

The company will present the results from its second phase II trial of the shot on 3 April at the Second Annual Vaccines Congress in London.

The 90 people aged 65 and older who got the pair of shots, compared to 30 who received only the annual vaccine, mounted a stronger immune response to the three seasonal flu strains, as well as to a few other strains not in the seasonal vaccine.

For most infectious agents, one exposure teaches the body’s immune system to recognize and destroy the virus or bacterium. The standard flu vaccine teaches the body to recognize the virus's outer coating.

But influenza is constantly changing its stripes, mutating from year to year and forcing scientists to guess which three strains to include in the seasonal vaccine.

“This is crazy,” says Vincent Racaniello, a virologist at Columbia University in New York, who is not involved with the Biondvax trials. If there were one vaccine that worked for any kind of flu, no matter how it mutated its coat, the costs of protection would drop and pandemics could disappear, he says.

The Multimeric-001 vaccine comprises nine linked sections from three flu proteins from different parts of the virus. These represent a “common denominator” shared by more than 10,000 flu strains since 1940, says the company’s chief scientist Tamar Ben-Yedidia. Racaniello says that, in theory, this combination or proteins should be universal, because every strain of flu would have them.

In a study published in February in the Journal of Clinical Immunology1, BiondVax reported that its Multimeric-001 vaccine was safe and conferred immunity on its own. However, BiondVax thinks that a universal flu vaccine would be a tough sell to regulatory agencies.

Part of the challenge is that the standard test for a vaccine’s efficacy is based on the presence of antibodies to the ever-changing parts of the haemagglutinin protein on the outside of the virus in a vaccinated person's blood. It’s a test their universal vaccine is designed to fail, because Multimeric-001 does not confer immunity to these proteins.


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