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Clues Found to How Different Flu Vaccines Work
Date:3/31/2010

Japanese study reveals that immune response is unique to each type of shot

WEDNESDAY, March 31 (HealthDay News) -- A new Japanese study outlines the molecular and cellular reasons why some flu vaccines work better than others and could point the way to better protection with fewer side effects.

"By understanding the molecular mechanism of different flu vaccines through our findings, not only the rationale for current live-attenuated influenza vaccine for children, currently available in the United States, is warranted, but also what kind of adjuvant is needed for safer as well as efficient flu vaccine development," said Dr. Ken J. Ishii, an adjunct professor in the Osaka University Laboratory of Vaccine Science in Suita. He is lead author of a report in the March 31 issue of Science Translational Medicine.

An adjuvant is something added to a vaccine to increase the immune system's response. Adjuvants are not used in U.S. flu vaccines, although they are added to such vaccines in some other countries.

The journal report describes how Ishii and his colleagues methodically injected mice with the different kinds of flu vaccines that can be used: live virus, which contains a weakened form of the flu virus; inactivated whole-virus, in which the virus has been killed by heat or chemical treatment; and split-virus, which contain a fragment of the virus. The researchers then studied in detail the immune system response to each vaccine.

Split-virus flu vaccines are used in the United States. The study found that whole-virus vaccines provoke a greater immune response, which has both a good and a bad side, said David Topham, a flu virus expert who is an associate professor of microbiology and immunology at the University of Rochester in New York.

"The whole-virus vaccine is reactogenic," meaning that it can cause pain at the site of injection and other side effects, Topham said. The slightly lower imm
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