Influenza vaccines are prepared using virus strains in line with the WHO recommendations. Current seasonal influenza vaccines are trivalent, containing two subtypes of influenza A and one type B virus. In recent years these have closely matched viruses circulating subsequently, although the seasonal influenza vaccine produced in 2009/10 was poorly matched to the influenza A (H1N1)v strain that was subsequently predominant. Should a new influenza A subtype emerge with epidemic or pandemic potential, a monovalent vaccine against that strain is developed and implemented as in 2009 when the influenza A (H1N1)v strain emerged. The influenza A (H1N1)v strain is expected to be the predominant influenza strain once again during the 2010/11 influenza season. For this reason, WHO has recommended that this strain be included in the trivalent seasonal influenza vaccine for the 2010/11 influenza season.
You can read the full guidance here.
Influenza has a local link- some say it was John Huxham who first introduced the term to medical use in England.
John Huxham 1733, born in Harberton in 1672, lived later in Staverton.
1 comments:
Are they helping.Do the vaccinations protect?I do not know and I am confused.When the epidemic is spreading which would a new one every year ...what good does the old protection do?
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