  According  to a report released by the US Centers for Disease Control and Prevention (CDC)  and the World Health Organization (WHO), the three most common types of  influenza strains have changed in such a way that they are now showing signs of  resistance to the Tamiflu and Relenza vaccines. 

  For  the first time in 20 years, the CDC is recommending a complete reformulation of  the vaccine. In its FluView report for the week ending March 1, the CDC  announced its recommendations for the formulation of the influenza vaccine for  the 2008-2009 flu season. The recommendations are announced a year in advance  because of the lengthy process by which the vaccines are produced. All three of  the inactivated strains of the virus that were suggested for the 2008-2009  formulation are different from the current formulation.

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According to a report released by the US Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO), the three most common types of influenza strains have changed in such a way that they are now showing signs of resistance to the Tamiflu and Relenza vaccines