The world health organization (who) recommends that completely change the composition of influenza vaccines for the Northern hemisphere.
This decision is due to antigenic mismatch of vaccines and the viruses that cause epidemic.
When studying the epidemiological significance of different types of influenza virus in 2007-2008, it became clear that the existing vaccines are partially not the same antigenic properties of influenza viruses type A and virus type B. This means that the body’s immune response to the vaccine is far not in all cases will help to prevent the disease.
According to forecasts of experts who, in the future the epidemic season will be significant the following subtypes of the virus: A/Brisbane/H1N1/, A/Brisbane/H3N2/ and In/Florida/4/2006. Therefore, vaccines must contain the corresponding antigens.
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