Next winter in the Southern Hemisphere, vaccines against influenza should not be designed to protect against the seasonal H1N1 strain the pandemic strain H1N1 has replaced, according to the World health Organization (WHO) recommendations issued today.
Because guidelines explain the seasonal strain caused some homes since the discovery of the strain of swine flu last April.
WHO is therefore recommended that vaccine manufacturers get the seasonal H1N1 virus from formulations that also contain an H3N2 strain and a type B strain Brisbane. One possibility is that vaccine manufacturers will simply replace the virus fell with the H1N1 pandemic strain in a new trivalent product. Or countries may decide to use a monovalent vaccine, which protects against the pandemic strain and a bivalent product designed to work against H3N2 strain and Brisbane. Strategic Advisory Group of WHO experts will discuss these issues at its meeting in late October. WHO will not make recommendations for future vaccines against influenza in the northern hemisphere until February next year.
(This article was originally titled "WHO Simplifies vaccine against influenza for Sourthern Hemiphere" and has been corrected.)
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